c# generics - public class MyContainer where T: class, IComparable

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which are true? Please justify
public class MyContainer<t> where T: class, IComparable
{

}
I. MyContainer class demands that the generic parameter implements IComparable interface.
II. The compiler will report an error for that code block. - False
III. There are multiple constraints on MyContainer generic parameter definition. -True
IV. MyContainer class demands that the generic parameter is of reference type and also implements the IComparable interface.

I tried for option 2 and 3. But donno for 1 and 4. Please clarify