The instruction cycle is based on the following parts: (in order)a.execution and fetchb.execution and storec.fetch and stored.fetch and execution

The correct order of the instruction cycle is: fetch and execution. So, the correct answer is d. fetch and execution.

Here's a step by step breakdown of the instruction cycle:

1. Fetch: The process begins with the fetch step where the CPU places the address of the next instruction to be executed into the address bus and sends a control signal to the memory to fetch the instruction located at that address.

2. Decode: Once the instruction is fetched from the memory, it is then decoded by the instruction decoder of the CPU. The decoder identifies the instruction and prepares the CPU to execute it.

3. Execute: In the execute step, the CPU performs the operation specified by the instruction. This could be an arithmetic operation, a data transfer operation, or any other operation.

4. Store: Finally, the result of the operation is stored back into the memory or in a register.

So, the correct sequence is fetch, decode, execute, and store.