Each entry in a crontab must end with which of the following characters?

While tabs are used to separate fields *within* a cron entry, they do not mark the end of the entire entry.

Spaces are used to separate fields and arguments within a command, not to terminate the entire entry.

A backslash is typically used for line continuation in shell scripts or escaping characters, not to terminate a crontab entry.

Cron entries are line-oriented; the cron daemon reads each line as a distinct job definition. Therefore, a newline character (` `) is essential to signal the end of one job entry and ensure that subsequent entries (or the end of the file) are correctly processed. Without a newline, the last entry might not be executed or could cause parsing errors.