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1. When we declare protocols, the Self keyword signifies:
   1. The type that implements the protocol.
   2. The instance of a class that conforms to the protocol.
   3. The instance of a struct that conforms to the protocol.

2. Generics allow us to declare a class that:
   1. Can use a generic type only as the type for stored and type properties.
   2. Can use a generic type only as an argument for its initializers.
   3. Can work with many generic types.

3. The open class ImmutableVector3D<T: FloatingPoint> line means:
   1. The generic type constraint specifies that T must conform to the ImmutableVector3D protocol or belong to the ImmutableVector3D class hierarchy.
   2. The generic type constraint specifies that T must conform to the FloatingPoint protocol or belong to the FloatingPoint class hierarchy.
   3. The class is a subclass of FloatingPoint.

4. The open class Party<T: AnimalProtocol> where T: Equatable line means:
   1. The generic type constraint specifies that T must conform to both the AnimalProtocol and Equatable protocols...