Which two options are valid to create vApp in the vSphere Environment?

Which two options are valid to create vApp in the vSphere Environment?
(Choose two.)
A. Login using vSphere C# Client to the ESXi host, right click on the host and select Create new vApp.
B. Login using vSphere Host Client to the ESXi host, right click on the host and select Create new vApp.
C. Login using vSphere WebClient to the vCenter Server, right click on the Cluster and select Create new vApp.
D. Login using vSphere WebClient to the vCenter Server, right click on the standalone ESXi host and select Create new vApp.