If $$\cos \left(x-y\right)=\frac{\sqrt{3}}{2}$$ and $$\sin \left(x+y\right)=1$$, where x and y are positive acute angle and $$x \geq y$$, then x and y are ($$0^{\circ}<\left(x+y\right)\leq 90^{\circ}$$)

A

$$70^{\circ} ; 20^{\circ}$$

B

$$50^{\circ} ; 40^{\circ}$$

C

$$80^{\circ} ; 10^{\circ}$$

D

$$60^{\circ} ; 30^{\circ}$$