Which type of virtual machines can an existing pool contain when cloning an Automated Desktop Pool f

Which type of virtual machines can an existing pool contain when cloning an Automated Desktop Pool from an existing pool?

A. RDS desktops

B. Manual desktops

C. Linked clones

D. Instant clones

Reference: https://pubs.vmware.com/horizon-7-view/index.jsp?topic=%2Fcom.vmware.horizon-view.desktops.doc%2FGUID-BA25DED9-DF6D-478C-A543-0E1F2126FB78.html