In a typical system design specification, the section describes the constraints, or conditions, affecting a system, including any requirements that involve operations, hardware, systems software, or security.

System component section

Explanation:In any particular system ,there is a section containing all the subsystem parts such hardware components, software system, operating parts etc which is known as the system component section.It is a place in the system for defining all the parts of it separately.

In typical system it acts as the block that has the interconnection of these components in which each component performs their own specific function.

the difference is right there dont you see it

i think the answer is a or d