What is the pre-requisite for resetting a vApp?

What is the pre-requisite for resetting a vApp?
A. The vApp and the VMs in it must be powered on.
B. The VMs in the vApp must be running with the latest hardware version supported by the vCenter Server.
C. The vApp must not have any added network.
D. The vApp must be in a powered-off state.