You work as a Network Administrator for Net Perfect Inc.

In order to replace all the occurrences of "net" with "Net" in the first fifty lines of the file, you will have to execute the following command: :1,50 s/net/Net/g

This command is issued in the command mode of the VI utility. 1,50 defines the initial and final line numbers of the current document where the command will execute. The s/ switch with the net/Net/g option will globally replace all the occurrences of "net" with "Net".

Answer option A is incorrect. This command will replace "net" with "Net" all over the current document.

Answer option B is incorrect. Since this command executes on the first 100 lines of a document, it will replace "net" with "Net" in all the 100 lines of the current document.

Answer option D is incorrect. This command will replace "net" with "Net" in the current line of the current document.