During the accounting period, Cash was debited for $4,000, $3,000, and $1,000. Cash was also credited for $3,000, $500, and $100. The beginning balance of Cash was a $10,000 debit. What is the ending balance of Cash on the post-closing trial balance?

$21,600, debit

$14,400, debit

$21,600, credit or

$14,400, credit

?