How is the file format of /etc/crontab different from a normal crontab file? (Select TWO correct answers)
A. The /etc/crontab file can specify a year field.
B. A normal crontab file must be installed with the crontab command.
C. A normal crontab file allows for environment variable substitution.
D. The /etc/crontab file has a user field for commands.
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