What are the three main types of computer security?

System security-2. communication security-3. physical security-a. system securityi) protection of information, capabilities and services on a system/server(1) sans, servers, desktops, network devices, etcb. communication securityi) protection of information while its being transmitted(1) also includes protection of the medium itself (in so far as its possible)c. physical securityi) protection from physical access to computer, communications equipment,facilities and personnel from damage or theft(1) all logical security controls must include physical security