What is the primary action a tower controller must take when a pilot reports a bird strike hazard in the vicinity of the aerodrome?

1. Issue an immediate warning to other aircraft in the pattern, broadcast a safety message, and notify aerodrome operations for bird dispersal.
2. Instruct all landing aircraft to enter a holding pattern until the birds disperse naturally.
3. Immediately close the runway for a minimum of two hours.
4. Issue a NOTAM to cancel all VFR flights within the terminal control area (TMA).