Which sentence demonstrates correct comma usage? Question 8 options: a) The employees were given two days to reply to the email with questions and if they didn't have questions, their pay increase was processed. b) The employees were given two days to reply to the email with questions, and if they didn't have questions their pay increase was processed. c) The employees were given two days to reply to the email with questions and if they didn't have questions their pay increase was processed. d) The employees were given two days to reply to the email with questions, and if they didn't have questions, their pay increase was processed