If an aircraft's static port becomes completely blocked by ice in flight, what erroneous indications will occur on the cockpit flight instruments?

1. The altimeter will freeze at the altitude where the blockage occurred, and the vertical speed indicator (VSI) will return to and remain at zero.
2. The airspeed indicator will read zero, and the altimeter will fluctuate rapidly.
3. The altimeter will show a continuous climb, while the airspeed indicator will freeze.
4. The gyroscopic instruments (attitude indicator and heading indicator) will spin out and fail.