A. Hidden
B. Private
C. Trusted
D. Secret
✅ The correct answer is option D.
Hidden : put or keep out of sight.
Hidden : put or keep out of sight.
Private : belonging to or for the use of one particular person or group of people only.
Trusted : regarded as reliable or truthful.
Secret : not known or seen or not meant to be known or seen by others.
Confidential : intended to be kept secret.
Synonym of Confidential is Secret