The following is a shell program, read the code and answer the question:(comments: "tar rvf ... " is used to append the file into an archive) for i in `find $1 – name *.c -print` do tar rvf back.c $i 2>/dev/null done (1) What is the value of $1
A.
all the files with the suffix .c in the system
B.
The argument specified in the command line to determine the starting directory for the searching
C.
all the files with the suffix .c in /dev/null
D.
The argument specified in the command line to determine the file type for the searching