• The range A1:C9 includes all the cells from A1 to C9, which covers the cells in columns A, B, and C from row 1 to row 9.
• The colon (:) is used in Excel to define a continuous range of cells, starting from the first cell (A1) and extending to the last cell (C9).

Why Other Options are Incorrect:

• (a) A1-C9: This notation is incorrect. The hyphen (-) is not used to define ranges in Excel.
• (c) A1 to C9: This is a textual description of the range but not valid Excel syntax.
• (d) A1$C9: This combines an absolute reference ($) with a cell reference, which doesn't correctly define a range.

In a packet-switched network, data is transmitted using a connectionless service. The correct method for this is datagrams.

• Datagram: In a packet-switched network, especially in a connectionless service like the Internet, data is divided into smaller packets called datagrams. Each datagram is sent independently and can take different paths to reach the destination. The network does not establish a dedicated connection before transmitting the data, which is why it's called connectionless.

Why Other Options are Incorrect:

• (b) Segments: These are typically used in connection-oriented protocols like TCP, where data is segmented and reassembled at the destination.
• (c) Switches: These are devices used to route data within a network but do not themselves transmit data on a connectionless service.
• (d) Message: This is a general term for data but does not specify the method used for transmission in a connectionless service.

The formula to be used when you need to add all the values in a column based on more than one condition is SUMIFS.

• SUMIFS allows you to sum the values in a range that meet multiple criteria. It can handle more than one condition, making it ideal for situations where you need to filter and sum data based on several conditions.

For example, if you have a column of sales data and want to sum only the sales for a specific product in a specific region, you would use the SUMIFS function.

=SUMIFS(sum_range, criteria_range1, criteria1, criteria_range2, criteria2, ...)
 

AutoFit Column: Although Excel allows you to autofit columns, "AutoFit Column" is not explicitly listed as an individual option under the Layout tab in most applications like Word. The option might be implied under broader AutoFit settings but isn't typically a standalone option.

Ctrl + K: This is the standard shortcut used across many programs, including Microsoft Word, Excel, and Outlook, to insert a hyperlink. Once you press Ctrl + K after selecting the text, a dialog box appears where you can enter the URL or link destination.