Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many season 4 appearances are there by Mrs. Jennifer Knight?

### Inputs:
table_name: table, columns: ['Character', 'Played by', 'Season 1', 'Season 2', 'Season 3', 'Season 4', 'First Appearance']

### Response:
SELECT MIN Season 4 FROM table WHERE Character = Mrs. Jennifer Knight