Trim encompasses which of the following?

Trim is a term used in construction and interior design to refer to the finishing elements that enhance the overall aesthetic of a space. It serves both decorative and functional purposes, including covering gaps and adding visual interest.

Picture molds are decorative pieces typically found at the top of walls or around artwork, serving to frame the art and add style to the room. Chair rails are horizontal strips of wood or other materials placed around the room, often at the height of a chair back, to protect the walls from damage and to visually break up the wall space. Baseboards, positioned at the bottom of walls, provide a finished look while also covering the joint between the wall and the floor, further adding to the overall design coherence.

Since trim includes all these elements—picture molds, chair rails, and baseboards—the comprehensive nature of the definition allows for all three to be categorized under trim. This makes the inclusion of all options as correct in defining trim the most accurate response.