Which of the following reactions is/are a redox reaction? Select all that apply. The reactions are

Which of the following reactions is/are a redox reaction? Select all that apply. The reactions are not necessarliy balanced!a. Cu(NO3)2 + Pb (s) > Cu (s) + Pb (NO3)2b. Pb (NO3)2 + HBr > PbBr2 (s) + HNO3 (aq)c. Mn2+ + PbO2 > Pb2+ + MnO4-d. 2 HNO3 + Na2O > 2 H2O + 2 NaNO3e. Ag+ + N