Idt stands for
? interrupt descriptor table
? individual descriptor table
? inline data table
? interrupt descriptor table

Interrupt descriptor table

Explanation:

In x86 architecture we use Interrupt descriptor table(IDT) which is data structure to produce an Interrupt vector table(IVT). The processor uses the IDT to form the right reaction to interrupts and exceptions.

It is the equivalent of the Protected mode to the (Interrupt Vector Table(IVT)) Real mode stating at the position of Interrupt Service Routines (ISR)  (one per interrupt vector).

Address and size of IDT  is kept in the CPU's IDTR register. LIDT, SIDT instructions are used for storing.

i think the answer is a or d