Multiple choice technology programming languages $touch {a}_{b,c} What is the output creates a_b,c file syntax error changes the timestamps of a_bc file creates a_b and a_c files Reveal answer Fill a bubble to check yourself D Correct answer Explanation Shell brace expansion evaluates {a}_{b,c} into the arguments a_b and a_c. Consequently, running touch on this pattern creates or updates the timestamps of both a_b and a_c files.