what is an alternative to backquotes (as in blah= wc-c hello.c) in bash. a. The dollar notation (as in blah=$WC - hello.c) b. Single quotes (as in blah='wc - hello.c') c. Double quotes (as in blah="Wc - hello.c'') d. The dollar-parenthesis notation (as in blah=$(wc - hello.c)) on 457 4