Will give brainlest to right answer and the fastest

technician a says that a cylinder head may house many vital engine components, including the crankshaft, spark plug, connecting rods, and camshaft. technician b says in an aluminum cylinder head, the valve seats and valve guides are separate steel parts that are pressed tightly into the head. who is right?

a. b only
b. a only
c. both a and b
d. neither a nor b