Given the following output from the ls command, how many files are linked with file1? drwxr-xr-x 3 root root 4096 apr 8 07: 12 desktop -rw-r--r-- 3 root root 282 apr 29 22: 06 file1 -rw-r--r-- 1 root root 282 apr 29 22: 06 file2 -rw-r--r-- 4 root root 282 apr 29 22: 06 file3 -rw-r--r-- 2 root root 282 apr 29 22: 06 file4 -rw-r--r-- 1 root root 282 apr 29 22: 06 file5 -rw-r--r-- 1 user1 sys 282 apr 29 22: 06 file6

a. one
b. two
c. three
d. four