iF x, y, AnD z ArE positivE intEgErs AnD x²=y²+z², whiCh oF thE Following must BE truE
ⅰ.x＞z
ⅱ.x=y+z
ⅲ. y²+z² is A positivE intEgEr
A、ⅰ only
B、ⅱ only
C、ⅲ only
D、ⅰ AnD ⅱ only
E、ⅰ AnD ⅲ only