Let R be the relation on Z$>=($the set of integers$)$ defined by

$($x$,$ y$)$ in R iff x$2+$ y$2=2$k for some integers k $>=0.$

Which one of the following is NOT an ordered pair in R$?$

Select one:

a$.$

$(3,2)$

b$.$

$(0,0)$

c$.$

$(2,4)$

d$.$

$(5,7)$