After enumerating Windows users and groups, you obtained the piece of information below.

S$-1-5-21-1607980848-492894223-1202660629-500$

What does it represents?

a$.$ The RID of the administrator

b$.$ The SID of the guest group

c$.$ The SID of the administrator

d$.$ The SID of the guest user

e$.$ The RID of the guest user