You have the information about the bonds below with the various terms and features associated with these bonds, such as yield to maturity, call provisions, convertibility, duration, convexity and the like.

Issuer	Face Value	Coupon Rate	Rating	Quoted Price	Years until Maturity	Sinking Fund	Call Period
Transatlantic	$1,000	8%	AAA	$1,020	10	Yes	3 Years
Medlife	$1,000	6%	AAA	$1,000	10	No	5 Years
XYZ Company	$1,000	5%	AA	$940	10	Yes	5 Years
XYZ Company	$1,000	0%	AA	$820	15	Yes	NA

1. Please mention the type of each bond (premium, discount, par, zero coupon bonds?)
2. Please calculate the nominal and effective yield to maturity of each bonds assuming that the bonds pay the coupons semiannually.
3. Please assume that you buy these bonds, reinvest any coupons received at the rate of 4% per year, and hold them until mature, what will be your realized return for each bond?
4. What is a call period?