With reference to Karl Marx's work 'Critique of the Gotha Programme', consider the following statements:

1. In this, Marx distinguished between two phases (Lower and Higher) of Communist society.
2. The principle "From each according to his ability, to each according to his needs" applies to the 'First Phase' of communism.
3. In this book, Marx discussed the concept of the 'Revolutionary Dictatorship of the Proletariat'.

Which of the statement(s) given above is/are correct?