Caleb, operator of a window washing business, sent a letter to Apartments, Inc. stating: "I will wash the windows of your apartment buildings at $4.10 per window to be paid upon completion of the work." Apartments, Inc. accepted the offer. Caleb wrote back: "I will wash the windows during the week commencing July 10 and direct you to pay the money you will owe me to my son, Bernie. I am giving it to him as a wedding present." Caleb also sent a signed copy of this letter to Bernie. Caleb washed the windows during the time stated and demanded payment to him of $8,200 (2,000 windows x $4.10 each), informing Apartment, Inc. that he had changed his mind about having the money paid to Bernie. Discuss the rights of Caleb and Bernie to the $8,200. To whom should Apartments, Inc. make payment? Why?