When memory is overcommitted, which of the following settings determine the amount of memory (above the virtual machine’s Reservation) that is granted to a given virtual machine? (Choose Two)

A.
Working Set Size

B.
Shares

C.
Slot Size

D.
Idle Memory Tax

Explanation:
According to "vSphere Resource Management Guide" page 29:
An ESX/ESXi host determines allocations for each virtual machine based on the number of shares allocated to it and an estimate of its recent working set size.