[单选题]

Primary memory is stored on chips located(66). In addition, computers usually use disks as second memory, for example,(67)disks located inside the computer.
A．on the motherboard
B．outside
C．inside the processor
D．on the CPU

Primary memory is stored on chips located(66). In addition, computers usually use disks as second memory, for example,(67)disks located inside the computer.A．on the motherboardB．outsideC．inside the processorD．on the CPU