!((x<1)) || (y<5)) (there could be more than one )


a) !(x<1)  && !(y>=5)
b)  (x>=1)  ||   (y<5)
c)  (x>=1)  &&   (y<5)
d) !((x<1) && (y>=5))
e) !(x<1)  &&  (y<=5)