How do radiography and sonography compare?

a. each technique increases the risk of developing cancer.
b. radiography uses x-rays, but sonography uses radio waves.
c. each technique uses mechanical waves.
d. radiography uses ionizing radiation, but sonography does not.

D.Radiography uses ionizing radiation, but sonography does not.

Explanation:

Radiography is the process of using x-rays or gamma rays to capture images showing internal parts of the human body for medical examinations.X-rays are commonly used in this process.x-rays are categorized as a cancer causing agent thus exposure to such rays could cause development of cancer.In sonography, high frequency sound waves are used. There is no exposure to any ionization radiation like in radiography.