You are a software engineer at a large software company. You are tired of having to log in to test your program, so you write the code so that it allows you to bypass the login screen. You leave this in the software so that

when the software is sold, you can log in to the computer at the customer's site. This is best categorized as a$/$an

a$.$ Remote Acess Trojan

b$.$ Worm

c$.$ Backdoor

d$.$ Trojan Horse