how should I choose the separator pressure for this question? the bubble point pressure is 2620psig and the relative volume is 0.9703 at the pressure in question

Question 1 Calculate the formation volume factor of oil for Good Oil Co. No. 4 at 4500psig. Use optimum separator conditions. SEPARATOR TESTS OF Reservoir Fluid SAMPLE (1) Gas/Oil Ratio in cubic feet of gas ( 60F, and 14,65 . PSI absolute per barrel of oll (9 indicated pressure and tempersture. (2) Gas/Oil Ratio in cubic feet of gas @ 60 F, and_14.65_..PSI absolate per barrel of stock tank oil (Q) 60F. (8) Formation Volume Factor is barrels of saturated oil @ 2620 PSI gauge and 220 .. F. per barrel of stock tank oil ( 60F. (4) Separator Volume Factor is barrels of oil @ indicated pressure and temperature per barrel of atock tank oil @60 F