**Core Concept**
Purkinje cells are the primary output neurons of the cerebellar cortex, playing a crucial role in motor coordination and learning. They receive excitatory inputs from parallel fibers and inhibitory inputs from basket and stellate cells.

**Why the Correct Answer is Right**
Purkinje cells are indeed connected to basket cells, which are a type of inhibitory interneuron that synapse onto the soma of Purkinje cells, releasing GABA (gamma-aminobutyric acid) to modulate their activity. Stellate cells are another type of inhibitory interneuron that synapse onto the dendrites of Purkinje cells, also releasing GABA to inhibit their activity. Additionally, Purkinje cells project axons to the deep cerebellar nuclei, which are a group of nuclei located in the white matter of the cerebellum and play a crucial role in the final processing and transmission of motor information from the cerebellum to the brainstem and spinal cord.

**Why Each Wrong Option is Incorrect**
**Option A:** Basket cells are a type of inhibitory interneuron that synapse onto Purkinje cells, but they are not the only type of cell that Purkinje cells are connected to. Therefore, option A is incorrect because it is incomplete.

**Option B:** Stellate cells are indeed connected to Purkinje cells, but like basket cells, they are not the only type of cell that Purkinje cells are connected to. Therefore, option B is incorrect because it is incomplete.

**Clinical Pearl / High-Yield Fact**
The connections between Purkinje cells and inhibitory interneurons like basket and stellate cells are crucial for the regulation of motor activity and the development of motor learning. Damage to these connections can lead to ataxia and other motor coordination disorders.

**Correct Answer Line**
✓ Correct Answer: D. All of the above