I like pushing buttons that do absolutely nothing

Why would a battery be included as a component on a motherboard?

A) The power from the battery “jump starts” the boot process

B) The battery maintains the BIOS configuration

C) The additional voltage protects the motherboard against power surges

D) Modern CPUs require additional power

E) Cooling fans and other small motherboard components are powered from the battery

F) It’s a spare for my remote