【单选题】The following is a shell program. Read it and answer read name if [ $name = "Jack" ]; then echo "hello Jack" else echo "I do not know you ” fi What is the role of '[]'
A.
Refer the string variable name and determine if it is equal to Jack
B.
Determine whether the variable name is Jack
C.
Determine whether the variable Jack is $name
D.
Refer the string variable Jack and determine if it is equal to $name