X and Y are partners in a certain business, X being the managing partner. Z has two debts: first, to X in the amount of Php5,000.00 and second, to the partnership in Php10,000.00. Both credits are demandable. Z pays X Php3,000.00 and the latter issues a receipt in his name. What is the obligation of X?

a.X should collect Php2,000.00 for himself and apply Php1,000.00 to the partnership credit.

b.X should collect Php1,000.00 for himself and apply Php2,000.00 to the partnership credit.

c.X should collect Php3,000.00 for himself since the receipt is in his name

d.X should collect Php3,000.00 on behalf of the partnership