3. An engine compression test identifies that one cylinder has lowcompression. During a leak down test of the cylinder, excessive leakageis observed and air is heard coming out of the tail pipe. Which of thesecould be the cause?(A) Broken piston rings(B)A blown head gasket(C)A leaking exhaust manifold gasket(D) An exhaust valve not seating4. A technician is reassembling a cylinder head. In the illustration shown, which of these is thetechnician measuring? (A) Installed stem height(B)Valve spring squareness(C) Installed spring height(D)Valve spring pressure