Final Answer:
The image intensification viewing system that exhibits the longest processing time is 4. cine.
Step-by-step explanation:
In medical imaging, different viewing systems are used to examine radiographic images. Among the options given, cine refers to a continuous sequence of X-ray images captured over time, often used in fluoroscopy. Cine systems record and display a series of frames, resulting in a longer processing time compared to other methods. Spot film (1. spot film) involves capturing single static images, providing a quicker process.
Photospot/digital (2. photospot/digital) refers to capturing images digitally, which generally has a faster processing time than cine. Videotape (3. videotape) involves recording moving images, but cine typically exhibits a longer processing time due to the continuous sequence of frames.
Option D (cine) is the answer.