Q1: The correct answer is that if both V and W are classes, then class X can't inherit from both, so there is no "diamond problem" in C#.
Also, interfaces don't "allows multiple class inheritance", they don't allow inheritance at all, because you don't inherit an interface, you implement an interface. In C# a class can inherit one other class and it can implement any number of interfaces.
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Q1: The correct answer is that if both V and W are classes, then class X can't inherit from both, so there is no "diamond problem" in C#.
Also, interfaces don't "allows multiple class inheritance", they don't allow inheritance at all, because you don't inherit an interface, you implement an interface. In C# a class can inherit one other class and it can implement any number of interfaces.