The correct answer is Ultrasound examination.
An ultrasound scan refers to a medical examination, which utilizes high-frequency sound waves to witness live images from within the body. It is also known as sonography. Like other imaging procedures, ultrasound implies no radiation. Due to this, it is usually considered a method for observing a developing fetus at the time of pregnancy.
The majority of the individuals relate ultrasound scans with pregnancy. These scans can offer an expectant mother with the first observation of her unborn child, though the test has various other applications.