Which four elements can a vSphere Lifecycle Manager image contain? (Choose four.)

An administrator has been notified that a number of hosts are not compliant with the company policy for time synchronization.
The relevant portion of the policy states:
* All physical servers must synchronize time with an external time source that is accurate to the microsecond. Which step should the administrator take to ensure compliance with the policy?

An administrator is investigating reports of users experiencing difficulties logging into a VMware vCenter instance using LDAP accounts.
Which service should the administrator check as part of troubleshooting?

An administrator is responsible for the management of a VMware vCenter instance that is currently experience performance issues. The administrator quickly identifies that the CPU and memory utilization of vCenter is consistently over 90%. Upon further analysis, it seems that the vpxd process is contributing significantly to the performance issue.
A combination of which four steps should the administrator take to resolve the performance issues and ensure that a similar issue can be rectified without required downtime to vCenter moving forward? (Choose four.)

An administrator is tasked with installing VMware vCenter. The vCenter Server Appliance must support an environment of:
* 400 hosts
* 4000 virtual machines
Which two resources must be allocated, at a minimum, to meet the requirements? (Choose two.)