Which of the following details must be kept confidential from patrons?

Maintaining confidentiality of certain details is essential in creating a safe and respectful environment within an aquatic facility. The correct answer highlights that all the listed categories—facility schedules, staff data, and contact information—should be kept confidential from patrons.

Confidentiality of facility schedules ensures that sensitive operational information is not disclosed, which could potentially disrupt planned activities or lead to security vulnerabilities. Keeping staff data private protects employees' personal information and maintains their trust, allowing them to work in a protective atmosphere free from scrutiny.

Furthermore, contact information is a critical piece of data that should be guarded to prevent misuse or harassment. Disclosing this information could lead to unwanted contact or privacy violations for both staff and patrons.

Thus, the necessity to uphold confidentiality across all these areas reinforces privacy protocols and protects individuals associated with the aquatic facility.