Your boss is trying to import the customers file into her spreadsheet program, but the data goes into the spreadsheet incorrectly. This is because the fields are separated by dashes (-) and the spreadsheet program requires the fields to be separated by colons (:). Which of the following commands can you use to convert the customers file?

a. replace - : customers
b. tr - "-" ":" < customers
c. sed %- % > customers
d. cat -r -/: customers