Let X = {1,2,3, 4, 5, 6} and Y = {1,3,5,7,9}. Which of the following is/are relations from X to Y?

X = {1,2,3, 4,5} Y = {1,3, 5, 7, 9}(a). R1={(x,y):y=2+x,x∈X,y∈Y}     x=1  y=3x=2  y=4x=3  y=5x=4  y=6x=5  y=7So, R is not a relation from X to Y. (b).      R2={(1,1),(2,1),(3,3)(4,3),(5,5)} R2⊆X×Y(c).      R3={(1,1),(1,3),(3,5)3,7(5,7)} R3⊆X×Y(d). R4⊈X×Y