Answer: a)Physical access
Explanation: Physical access is the function that permits the accessing of the computer system in a physical way. This access work on the building, It organization and other physical buildings.This access make the system prone to high amount of corruption and hacking .
Other options are incorrect because technical access is for the accessing the technical parts,operational access is for controlling the functions and remote access is for accessing the system from remote area.Thus the correct option is option (a).