Final answer:
To view processor and memory configuration in the vSphere client, use the Configuration tab which provides details on hardware specifications. (Option C).
Step-by-step explanation:
The tab you can use to view processor and memory configuration information in the vSphere client is the C) Configuration tab.
Within the Configuration tab, you can find details about the hardware specifications of the host, including CPU model and speed, total memory, and the way resources are allocated to the virtual machines.
To get a comprehensive view, you may need to delve into sub-sections like 'Hardware' and 'Software' for more specifics on the processor and memory setup of your servers.