单选题A developer wants too use EL to invoke a function using S{my：bloof（“foof”）}. Which is always true？（）A The method invoked by this function must be statie.B The function class must implement the Function interface.C The expression is NOT a valid EL expression for invoking a function.D The function must be declared in a web.xml file using the element.E The function class must have a method with the signature：Void bloof （java.lang.Strings）
单选题
A developer wants too use EL to invoke a function using S{my：bloof（“foof”）}. Which is always true？（）
A
The method invoked by this function must be statie.
B
The function class must implement the Function interface.
C
The expression is NOT a valid EL expression for invoking a function.
D
The function must be declared in a web.xml file using the
E
The function class must have a method with the signature：Void bloof （java.lang.Strings）
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