Stockholders' equity and total assets decreased $4,000. The transaction or AJE that caused this could have been which of the following?
a) The payment of a $4,000 dividend on the payment date.
b) A normal AJE of $4,000 for supplies that were used.
c) Cash of $4,000 paid to satisfy an account payable.
d) An AJE of $4,000 for an accrued expense.