A carbamate is a functional group that is derived from carbamic acid. Structurally, it contains both an ester group and an amide group. Specifically, the carbamate structure can be represented as:
\([ {O=C(NR_{1}R_{2})OR_{3}} ] \)
Where \(( R_{1} ), ( R_{2} ), and ( R_{3} ) \)are alkyl or aryl groups.
So, the correct answer is: C. An amide and an ester group