How many bit vector number is used in an interrupt cycle of 80386?

The correct answer is: D. 32

An interrupt cycle is a sequence of events that occurs when a device or software interrupts the normal execution of a program. The 80386 microprocessor uses a 32-bit vector number to identify the interrupt source. This vector number is stored in the interrupt descriptor table (IDT), which is a table of pointers to interrupt service routines (ISRs). When an interrupt occurs, the 80386 fetches the vector number from the IDT and uses it to index into the IDT to find the address of the corresponding ISR. The ISR then handles the interrupt and returns control to the interrupted program.

Option A is incorrect because the 80386 uses a 32-bit vector number, not a 4-bit vector number.

Option B is incorrect because the 80386 uses a 32-bit vector number, not an 8-bit vector number.

Option C is incorrect because the 80386 uses a 32-bit vector number, not a 16-bit vector number.