Iggy and Jon Sign a Contract by Which Iggy Agrees

Multiple Choice

Iggy and Jon sign a contract by which Iggy agrees to deliver and install a gas fireplace on October 15 in exchange for Jon's promise to pay the $500 price within ten days of the install date. The delivery and installation of the fireplace and the payment of the price are examples of

A) conditions precedent.
B) concurrent conditions.
C) conditions subsequent.
D) implied conditions.