Final Answer:
Both. Both Tech A and Tech B are correct; X and Y can be replaced without removing the head. Option C is the answer.
Step-by-step explanation:
When Tech A says that X can be replaced without removing the head and Tech B says the same for Y, it means both components (X and Y) are accessible and replaceable without requiring the removal of the cylinder head. This suggests that the components are likely positioned in a way that allows for straightforward replacement, possibly without major disassembly.
Option 3 (Both) is the correct choice, indicating that both statements are accurate. This scenario is common in automotive repair or maintenance, where some components are strategically placed for easier accessibility and replacement without extensive disassembly.
Option C is the answer.