I need typed answer with explanation otherwise I will report to your answer and don't use AI BOT give me a proper explanation I will thumb up.

A corporation uses a perpetual inventory system. It purchased $2,000 of merchandise on July 5 on account with terms 2/10, n/30. It returned $400 of the merchandise on July 9. It pays on July 21. Which of the following is part of the journal entry it records when it pays on July 21? Credit to Accounts Payable for $1,600 O Debit to Cash for $1,600 O Debit to Accounts Payable for $2,000 Credit to Cash for $1,600 Debit to inventory for $2,000