Explanation:

- Option 1: Cream and cake

- This is not correct. J.J. Thomson’s model is not referred to as the "Cream and cake" model.

- Option 2: Plum and pudding

- This is correct. J.J. Thomson proposed the "Plum pudding" model of the atom where electrons were embedded in a sea of positive charge, similar to plums within a pudding.

- The model was an early theory about the atomic structure before the discovery of the nucleus.

- Option 3: Plum and cake

- This is not correct. While it mentions "plum," it doesn’t match the familiar name of the model.

- Option 4: Cream and pudding

- This combination is incorrect. It does not align with the historical context or terminology used for J.J. Thomson's atomic model.