Final answer:
The BGA (Ball Grid Array) socket type is soldered to the motherboard along with the CPU, making the CPU non-replaceable by the user.
Step-by-step explanation:
The socket type that is soldered to the motherboard, along with the CPU, is BGA (Ball Grid Array). Unlike other socket types, BGA sockets involve soldering the CPU directly to the motherboard, which means the CPU is not user-replaceable or upgradable. This is in contrast to socket types like PGA (Pin Grid Array) and FCLGA (Flip Chip Land Grid Array), where the CPU is inserted into a socket with pins or pads that allow for CPU replacement or upgrades.