Final answer:
VMware Update Manager (VUM) is used to patch Hypervisors in a VMware vSphere environment, ensuring that the ESXi hosts are up-to-date with the latest patches.
Step-by-step explanation:
VMware Update Manager (VUM) can patch B) Hypervisors. VUM is a utility that automates patch management and eliminates manual tracking and patching of VMware vSphere hosts and virtual machines. VUM can scan your vSphere environment to identify missing patches for the ESXi hosts and will help to ensure that the software running on your hypervisors is up to date. It does not directly deal with operating systems, application software, or external devices such as printers.