What is the difference between indicated airspeed and true airspeed and which is typically monitored in IMT 1?

What is the difference between indicated airspeed and true airspeed and which is typically monitored in IMT 1?

• A. Indicated airspeed is what the cockpit shows; true airspeed is the speed through the air; IMT 1 primarily uses indicated airspeed.
• B. Indicated airspeed equals true airspeed in all conditions; IMT 1 uses true airspeed.
• C. Indicated airspeed is what the cockpit shows; true airspeed is actual speed through the air; IMT 1 primarily uses true airspeed.
• D. Indicated airspeed is the speed relative to the ground; true airspeed accounts for wind; IMT 1 uses indicated airspeed.

Answer: (C)