What should be installed on a VM to assist with VM-to-host time synchronization?

What should be installed on a VM to assist with VM-to-host time synchronization?

A. VMware Tools

B. vRA guest agent

C. vROps agent

D. Guest Operations Manager

Reference: https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.vm_admin.doc/GUID-C0D8326A-B6E7-4E61-8470-6C173FDDF656.html