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

### Instruction:
Which Alpha premultiplied has a 4:1 Compression ratio and a dxt3 FOURCC?

### Inputs:
table_name: table, columns: ['FOURCC', 'DX 10 Name', 'Description', 'Alpha premultiplied?', 'Compression ratio', 'Texture Type']

### Response:
SELECT Alpha premultiplied? FROM table WHERE Compression ratio = 4:1 AND FOURCC = dxt3