_______________ is the minimum clear floor space for a handicapped accessible wall or post water fountain or cooler.

The correct choice indicates that the minimum clear floor space required for a handicapped accessible wall or post water fountain or cooler is 30 inches by 48 inches. This dimension is specified in order to ensure that individuals with disabilities have sufficient room to maneuver a wheelchair or similar device to access the water fountain or cooler comfortably.

A clear floor space of 30 by 48 inches provides both the width and depth necessary for approach and use, taking into account the functional needs of varying mobility aids, ensuring compliance with accessibility standards established in plumbing codes. Such dimensions help eliminate barriers and promote inclusivity in public facilities, making essential amenities like drinking water accessible to everyone, regardless of their physical abilities.

The other options do not meet the required dimensions outlined in the code, which can lead to inadequate space for individuals needing accessible access.