Let g1 and g2 be groups and let g be a direct product of g1

Question

Let G1 and G2 be groups, and let G be a direct product of G1 x G2.
Let H = {(x1, x2) element G1 x G2 | x2 = e} and let K = {(x1, x2) element G1 x G2| x1 = e}.

(a) Show that H and K are subgroups of G.

(b) Show that HK = KH = G

(c) Show that H [see attachment] K = {(e,e)}.