Which of these is not a type of socket?

AGA (alternating grid array)

PGA (pin grid array)

SPGA (staggered pin grid array)

LGA (land grid array)

option A. AGA is the right answer.

Explanation:

PGA or pin grid array is a type of integrated circuit packaging. In a PGA, the package is square or rectangular, and the pins are arranged in a regular array on the underside of the package. The pins are commonly spaced 2.54 mm apart, and may or may not cover the entire underside of the package.

A staggered pin grid array (SPGA) is an integrated circuit socket style or pin-out having a staggered grid of pins surrounding the socket's edge, placed as several squares, one within the other. The structure is also known as intersecting squares, unlike PGA with the pins on the underside only.

The land grid array is a type of surface-mount packaging for integrated circuits that is notable for having the pins on the socket rather than the integrated circuit. A LGA can be electrically connected to a printed circuit board either by the use of a socket or by soldering directly to the board.