1. (1) Wet sump oil systems are most commonly used in gas turbine engines. (2) In most turbine engine oil tanks, a slight pressurization of the tank is desired to ensure a positive flow of oil. Regarding the above statements, A. both No. 1 and No. 2 are true. B. only No. 2 is true. C. neither No. 1 nor No. 2 is true.