When is it required to refuel the airplane to full tanks during solo operations? Select all that apply.
A. Before the solo warm-up.
B. After the solo warm-up, before local solo operations in the traffic pattern.
C. After the solo warm-up, before a solo cross-country flight.
D. At each intermediate stop during a solo cross-country flight.
E. At any stop during a solo cross-country flight where the student elects to take a 30-minute break.
F. If the student determines that the flight cannot be completed within 3.5 hours (2.5 hours, if flying an aircraft with a fuel capacity of less than 48 gallons).