Which one is true for LHLD instruction ? 

Explanation:

LHLD Instruction in Microprocessors

Definition: The LHLD (Load HL Pair Direct) instruction is used in microprocessor programming to load the contents of a specified memory location into the HL register pair. This instruction is part of the instruction set of the 8085 microprocessor, which is an 8-bit microprocessor.

Working Principle: When the LHLD instruction is executed, the microprocessor fetches the specified 16-bit address from the instruction and then loads the contents of the memory location at that address into the L register. Simultaneously, it loads the contents of the next consecutive memory location (address + 1) into the H register. This effectively loads the HL register pair with a 16-bit value from two consecutive memory locations.

Instruction Format: The LHLD instruction is a 3-byte instruction, where the first byte is the opcode for LHLD, and the next two bytes represent the 16-bit address from which the data is to be loaded. The instruction format can be illustrated as follows:

Opcode  | Address Low | Address High
-------------------------------------
LHLD    |   8-bit     |   8-bit

Correct Option Analysis:

The correct option is:

Option 2: Three Byte Instruction

This option correctly describes the LHLD instruction as a three-byte instruction. The first byte is the opcode, and the next two bytes represent the 16-bit address from which the data is to be loaded into the HL register pair.