Which statement is true regarding the installation of the motherboard and connecting power?

a$.$

a $4-$pin power cord supplies supplemental power to the processor

b$.$

the P$1$ connector is used for PCIe devices

c$.$

there are typically three screw sets that hold the motherboard to the case

d$.$

you can use an adapter to convert two $6-$pin connectors to a PCIe connector