What is the "area of interest" on a weld radiograph?

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What is the "area of interest" on a weld radiograph?
A . The entire radiograph minus 2 in. (50.8 mm) from the edges
B . Only the area of contrasting density
C . The specific portion of a radiograph that needs to be evaluated
D . The portion that is less than 3t from the center of the radiograph, where t is the thickness of the weld

Answer: C