Which of the following socket types is for an AMD CPU?

Socket 940 (also called mPGA940) is an AMD processor socket with 940 pins designed for Opteron server/workstation processors and early Athlon 64 FX desktop processors. AMD and Intel use incompatible socket designs, and socket 940 is exclusively an AMD platform. Its pin count and layout are specific to AMD's architecture of that generation.

Socket 775 (LGA775) is an Intel socket used for Pentium 4, Pentium D, Core 2 Duo, and Core 2 Quad processors.

Socket 1155 (LGA1155) is an Intel socket used for second and third generation Core i3, i5, and i7 processors (Sandy Bridge and Ivy Bridge).

Socket 1366 (LGA1366) is an Intel socket used for first generation Core i7 Extreme and Xeon processors (Nehalem/Bloomfield).