Which statement about yield is correct?

		For a coupon bond, if the yield is higher than the coupon rate, then price>100
		A zero-coupon bond may be priced above 100, assuming yield is positive
		For a given bond, the corresponding yield for price P1 is y1, and the yield for P2 is y2. If P1>P2, then y1
		The yield of a corporate bond is usually lower than the yield of a treasury debt, assuming the same maturity and coupon rate