green, the manager of an apartment complex owned by ABC properties, Inc., rented out several apartments but continued to list those apartments as "vacant" on her monthly reports. when these tenants paid their rent, green simply kept the checks, never recording the revenue. She forged the company's endorsement on the checks, then endorsed them in her own name and deposited them into her personal checking account. According to the Occuptaional Fraud and Abuse, Green's scheme can be classified as:

A) A commission scheme

B) An illegal gratuity

C) A forged endorsement scheme

D) A skimming scheme