Each entry in a crontab must end with what character?

A tab character is used to separate fields within a crontab entry, not to terminate the entry itself.

A space character separates fields within a crontab entry, similar to a tab, but does not terminate the entry.

A backslash is generally used for escaping characters or line continuation in shell commands, not for terminating crontab entries.

In a crontab file, each individual cron job entry must be on its own line and terminated by a newline character. This is a fundamental syntax requirement for cron to correctly parse and execute the scheduled tasks.