The correct answer is A. tee.
The tee command is a command-line utility for duplicating standard input to standard output and to a file. It can be used to create a backup of a file, to send output to both a file and a screen, or to split output to multiple files.
The tr command is a command-line utility for translating, squeezing, and deleting characters. It can be used to translate characters from one set to another, to squeeze out duplicate characters, or to delete certain characters.
The sort command is a command-line utility for sorting lines of text. It can be used to sort lines in ascending or descending order, to sort lines by a specific field, or to sort lines using a specific algorithm.
The grep command is a command-line utility for searching plain-text data sets for lines that match a regular expression. It can be used to search for a specific pattern of characters, to search for a specific word or phrase, or to search for a specific file.
None of the above options are correct.