Which symbol indicates the least favorable process priority?

In Linux, process priority is managed using a concept known as "nice values." The nice value determines the priority of a process, with lower values indicating a higher priority and higher values indicating a lower priority. The range of nice values typically goes from -20 to 19.

The least favorable process priority occurs at the highest nice value, which corresponds to the number 20 in this context. A nice value of 20 would mean that the process is running with the lowest priority, allowing other processes to run more effectively and ensuring that system resources are allocated to higher priority processes first.

In contrast, a nice value of 0 is the default priority level, while -20 represents the highest priority a process can have. A value of 1 is a slightly elevated priority. Therefore, option A, which indicates 20, is indeed the symbol that signifies the least favorable or lowest priority for a process, marking it as correct in the context of Linux process management.