need clarification for Constructors in c#

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C#

.NET

I want to know whether my understanding on the constructors is correct or not. I just tried to attempt a quiz for constructors but confused whether my understanding is correct or not

--> Every class needs at least one constructor defined - False (In C#, if you don't provide one, the compiler automatically provides a default constructor.)

--> It’s possible to avoid a class being instantiated by simply having only a private constructor on it. – False (A private constructor is a special instance constructor. It is generally used in classes that contain static members only. In a nutshell, you can still create an instance of a class with private constructor thru some other means (e.g. from static methods)

--> A static constructor in a non­static class is called once on each object creation. – False (If a static constructor has been called once, compiler will not call it again, it will get called once only .The execution of a static constructor is triggered by the first of the following events to occur within an application domain: 1. An instance of the class type is created. 2. Any of the static members of the class type are referenced.)

-->You can specify on the constructor which classes of interfaces that class is inheriting
( i don't know please clarify )