Your new boss just entered your office, he says "Bonjour Monsieur, comment allez-vous?". How would you answer his question?

By saying “Ça va. Et toi?”
By shake his Hand and saying ”Salut. Et vous?”
By saying “Bonjour. Et toi?” and shaking his hand.
By shaking his hand and saying ”Bonjour. Bien et vous?”