Final answer:
A sector on a storage device commonly includes a header, a data area, and a trailer. The header contains location information, the data area holds the user data, and the trailer has error-correcting codes to maintain data integrity. 'Main section' is not a standard term used in this context.
Step-by-step explanation:
The data structure for a sector on a storage device such as a hard drive or solid-state drive typically contains several components. The main components include the header, which is used to store information about the sector such as its address or position on the disk; the data area, which is the part of the sector where the actual user data is stored; and the trailer, which often contains error-correcting codes or other information used to ensure the integrity of the data. The term main section isn't typically used in the context of disk sector structures. Therefore, the elements that usually comprise a sector are the header, data area, and trailer.
In summary, the correct components of a sector data structure are a) header, b) data area, and c) trailer.