Is it permitted to use any other means for signaling when the electric signaling system is not functioning?

1. It is required to give signal by hand, but only in good weather conditions.
2. Correct answer: It is required under these circumstances to give signal by hand.
3. No. You must use the direction indicator for signaling.
4. It is required to give signal by hand, but only at night.

WhyIf the indicators are broken, you must give the signals by hand. Both by day and by night.