What are the two types of CPU sockets?

The two types of CPU sockets are indeed referred to as Land Grid Array (LGA) and Pin Grid Array (PGA).

LGA is a type of socket that utilizes a grid of lands or pads on the socket to make contact with the pins on the CPU. This design allows for better thermal performance and a more secure connection, as it minimizes the risk of bent pins during installation. It is commonly used in modern processors from manufacturers like Intel.

On the other hand, PGA sockets feature pins on the CPU itself that fit into corresponding holes in the socket. This type of design is typically seen in processors from AMD. The advantage of PGA sockets is that they can be easier to install since the pins are not as easily bent, but they can also lead to damage if the CPU is not carefully aligned during installation.

The other options presented do not relate to CPU sockets. DRAM and SRAM refer to types of memory, while virtual and physical memory are concepts relevant to system memory management. Integrated and discrete processing units describe classifications of CPUs based on their design and function, rather than socket types. Thus, the choice highlighting LGA and PGA as types of CPU sockets is correct.