Q$\mathrm{.}2.$ State TRUE or FALSE for the following statements. $[2\mathrm{.}5$ pts$]$

a$.$ ISAs must be Turing complete.

b$.$ ISA defines the data transfer and control mechanisms.

c$.$ An instruction is an octal word composed of n$-$bits and understood by the CPU.

d$.$ The One$-$address instruction format contains two explicit operands.

e$.$ The Arithmetic and Logic Unit $($ALU$)$ is responsible for directing control signals to all functional units of a microprocessor.