Each entry in a crontab must end with what character?

A tab character is used to separate fields within a crontab entry (like minute, hour, day of month, etc.), but not to end the entire entry.

A space character is used as a field separator, similar to a tab, but does not serve as the end-of-line delimiter.

A backslash is used for escaping characters or for line continuation in shell commands, not as a standard crontab entry terminator.

Each line in a crontab file represents a single cron job, and the cron daemon parses these entries by looking for newline characters as delimiters. Without a newline character at the end of each entry, the cron daemon may not correctly parse the last job or could interpret subsequent lines as part of the previous entry.