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.
Answer: B,D
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