My sister purchased a "Cooks nonstick bakeware pan (9 X 13 in), J.C. Penny home collection". This pan is Gray with the number 0015-F also there's another identification number SUPP 19963-8. Pan has "Silicone handles for sure and comfortable grip". These handles appear to be removable. QUESTION: are you supposed to remove these handles BEFORE using pan in oven? ThereÂs nothing in the baking and cleaning instructions which mentions removing the handles before putting pan in oven.