A pilot is performing visual patterns at a controlled aerodrome when he/she notices that the radio is unserviceable. The aircraft forms part of the aerodrome traffic. Of the items listed below, which answer correctly lists the light signals coming from the tower that a pilot may spot in flight? 

 1. Series of red flashes, meaning divert as the aerodrome is unsafe 

 2. Series of white flashes, meaning perform holding patterns and wait for further instructions 

 3. Series of green flashes, meaning approach to land at the aerodrome

 4. Steady green, meaning cleared to land 

 5. Steady red, meaning that the tower is closing