Explanation:

• In latest generation computers, the instructions are executed Both sequentially an parallely.
• In computer science, an instruction is a single operation of a processor defined by the processor instruction set. The size or length of an instruction varies widely, from as little as 4-bits in some microcontrollers to many as multiples of a bytes in some very long instruction word (VLIW) systems.
• The instruction set, also called instruction set architecture (ISA), is part of a computer that pertains to programming, which is basically machine language. ... An instruction set can be built into the hardware of the processor, or it can be emulated in software, using an interpreter.

Hence option 3rd is correct.