under what circumstance is it impossible to assign a default value parameter..., PHP Basics, Zend Certification

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Question:Under what circumstance is it impossible to assign a default value to a parameter while
declaring a function?

A When the parameter is Boolean 
B When the function is being declared as a member of a class 
C When the parameter is being declared as passed by reference 
D When the function contains only one parameter 
E Never

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+ AnswerC

+ ExplanationWhen a parameter is declared as being passed by reference you cannot specify a default value for it, since the interpreter will expect a variable that can be modified from within the function itself. Therefore, Answer C is correct.

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Question:Under what circumstance is it impossible to assign a default value to a parameter while declaring a function?

A When the parameter is Boolean

B When the function is being declared as a member of a class

C When the parameter is being declared as passed by reference

D When the function contains only one parameter

E Never

C