Final answer:
The execution of a machine language instruction code '153C' may change the content of memory at 3B, retrieve the content from 3C, or is independent of 3C, depending on the specific instruction set in Appendix C, which determines the meaning of '15' and how it interacts with the memory addresses.
Step-by-step explanation:
The question asks how the execution of a machine language instruction with the code 153C will interact with memory cells at locations 3B and 3C. The answer to this depends on the specific instruction set architecture detailed in Appendix C (which we do not have), but typically in machine language, an instruction beginning with a number like '15' might signify a certain operation, and the following characters refer to memory addresses. Without the specific details of the instruction set, we can't categorically answer whether the instruction changes the content of memory at 3B, retrieves the content at 3C, or is independent of memory at 3C. For example, if '15' indicates a 'store' operation, and '3C' is the address to store to, then execution of '153C' would change the memory at location '3C'. Conversely, if '15' indicates a 'load' operation, it may retrieve the contents from '3C', and if '15' stands for an operation that doesn't interact with memory (like a register operation), then it is independent of the contents of memory cell '3C'.