View the Exhibit. 
The root user issued the following command on mailqueue.txt shown in the Exhibit:
cat mailqueue.txt | cut -dr -f2- | cut -f2 | cut -d “@” -f2 | sort | uniq | wc -l
What is the purpose of using this command?
A.
to count the total number of e-mail addresses in the file
B.
to list the e-mail addresses after removing the duplicates
C.
to sort the e-mail addresses in mailqueue.txt and print it along with the total number of lines
D.
to determine how many different domains are available amongst the e-mail addresses in
mailqueue.txt
Explanation: