In the reaction, Cu(s0 + 2Ag⁺(aq) → Cu²⁺ + 2Ag(s)

A. Cu(s) is oxidised to Cu²⁺
B. Ag (aq) is oxidised to Ag (s)
C. Cu(s) reduced to Cu²⁺ (aq)
D. Both Cu(s) and Ag⁺ (aq) are oxidised