What is the next step the engineer should take to investigate this resource usage?

An engineer received an alert affecting the degraded performance of a critical server. Analysis showed a heavy CPU and memory load .

What is the next step the engineer should take to investigate this resource usage?
A . Run "ps -d" to decrease the priority state of high load processes to avoid resource exhaustion.
B . Run "ps -u" to find out who executed additional processes that caused a high load on a server.
C . Run "ps -ef" to understand which processes are taking a high amount of resources.
D . Run "ps -m" to capture the existing state of daemons and map required processes to
find the gap.

Answer: C

Explanation:

Reference: https://unix.stackexchange.com/questions/62182/please-explain-this-output-of-ps-ef-command