Which of the following instruments require inputs of both pitot and static pressure?
a. Airspeed indicator, machmeter and vertical speed indicator
b. Airspeed indicator, vertical speed indicator, altimeter
c. Airspeed indicator only
d. Airspeed indicator and machmeter
a. Airspeed indicator, machmeter and vertical speed indicator
b. Airspeed indicator, vertical speed indicator, altimeter
c. Airspeed indicator only
d. Airspeed indicator and machmeter