Which product(s) form(s) at each electrode in the aqueous electrolysis of the following salts? select as many as apply

k3po4

at the cathode: o2(g), h2(g), h+ (aq), or oh-(aq) [selected h2 (g) but says answer is incorrect]

at anode: o2(g), h2(g), h+ (aq), or oh-(aq) [selected o2 (g) but says answer is incorrect]