Question 20 For the next question, refer to the image below B ClassA +foo() void ClassX + foo(): void ClassB Given the following code snippet: ClassX a new ClassA(); ClassX b = new ClassB(); a. foo(); Whose method will be invoked in the function call (a.foo)? O ClassB's implementation of foo O None- results in an error O ClassA's implementation of foo ClassX's implementation of foo

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