$(17)$ Which statement is not correct about the DRAM types?

a$.$ DDR SDRAM is clocked on both rising and falling edges.

b$.$ EDO DRAM is designed to speed up the access time.

c$.$ SDRAM latches the address, data, and control information for synchronous oper$-$

ations.

d$.$ FRM DRAM is designed for very random memory access patterns.