The main functional blocks of a mul-tispectral scanner (MSS) are given below : 1. Video processor 2. Dispersive system 3. Detector 4. Signal conditioner 5. Collecting optics Which one of the following sequences is correct?

• 1, 4, 5, 3, 2
• 5, 3, 2, 4, 1
• 5, 2, 3, 1, 4
• 1, 3, 2, 4, 5