Provide the systematic name of the compound shown:
(A) 4 – butyl – 1 – ethyl – 2 – methylcycloheptane
(B) 4 – butyl – 2 – ethyl – 1 – methylcycloheptane
(C) 1 – butyl – 4 – ethyl – 3 – methylcycloheptane
(D) 2 – butyl – 4 – ethyl – 1 – methylcycloheptane