Given the task definition and input, reply with output. In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: consider a right circular cone of base radius 4 and height 10 cm . a cylinder is to be placed inside the cone with one of the flat surface resting on the base of the cone . find the largest possible total surface area ( in sq cm ) of the cylinder .
Options: ['a ) 100 / 3', 'b ) 80 / 3', 'c ) 120 / 7', 'd ) 130 / 9', 'e ) 110 / 7']
a