I'm going with B and D. After all, the /etc/crontab file is like the boss's version of a crontab, so it's got a user field that the regular crontab doesn't have.
I'm pretty sure the answer is B and D. The /etc/crontab file has a user field, but a normal crontab file is installed with the crontab command. That's the difference, right?
B and C are the correct answers. A normal crontab file needs to be installed using the crontab command, and it supports environment variable substitution, unlike the /etc/crontab file.
A and D seem like the correct answers. The /etc/crontab file has a user field to specify the user that the command should run as, and it can also specify a year field, which a normal crontab file cannot do.
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