Which of the Following Definitions Is Correct for the Junctional

Which of the following definitions is correct for the junctional epithelium?

A) Connective tissue structure involved in the attachment of the gingiva to the tooth
B) Connective tissue that functions to hold the gingiva against the tooth and bone
C) Epithelial tissue contributing to the adherence of the soft tissue to the tooth
D) Epithelial tissue functioning to protect the underlying oral structures and acting as a mechanical barrier