Which of the following is true in Linux/Unix?

A. The shell will always search the entire filesystem to find any command you type.

B. The shell will only search the current directory for commands you type.

C. The shell will only find commands if you provide the relative or absolute path to the command.

D. The shell will find commands that are in the directories listed in the shell path variable.

E. The shell will find commands that are in hash table built from the directories listed in the shell path variable.