How many cron fields are there for specifying the time to execute a cron job?

How many cron fields are there for specifying the time to execute a cron job?

A.
1

B.
3

C.
4

D.
5

E.
6

Explanation/Reference:
minute hour day month day/week

Example:
0 22 * * * /usr/local/bin/somecommand