Explanation:

• Researchers from the Netherlands Cancer Institute have recently discovered two “unexpected” areas in the back of the nasopharynx.
• When researchers were studying scans from about 100 people, they found a bilateral structure at the back of the nasopharynx and these glands had similar characteristics of salivary glands.

Salivary Gland Systems

• These are part of exocrine gland systems of Human Body.
• The salivary gland system in the human body has three paired major glands and over 1,000 minor glands that are spread throughout the mucosa.
• The three major salivary glands are called parotid, submandibular and sublingual.
• These glands produce saliva necessary for swallowing, digestion, tasting, mastication and dental hygiene.
• Researchers have proposed the name “tubarial glands” for their discovery.
• The proposed name is based on their anatomical location.
• Even so, it is not clear yet if these glands will be classified as a conglomerate of minor glands, as a major gland, a separate organ or a new part of an organ system.
• The researchers believe that these glands would qualify as the fourth pair of major salivary glands.
• The researchers believed that the new location of salivary glands will be a good news for patients with head and neck tumours as radiation oncologists will be able to bypass this area to avoid any complications during treatment.

Hence option 3rd is correct.