Listed below are several possible actions by firms. Select "INV" for those that reflect invention, "INN" for those that reflect innovation, and "DIF" for those that reflect diffusion. a. An auto manufacturer adds full self-driving as a standard feature in its luxury cars to keep pace with a rival firm whose luxury cars already have this feature. (Click to select) b. A video game production company pioneers the first fully immersive 3D metaverse music video channel. (Click to select) c. A firm develops and patents a working model of a self-erasing whiteboard for classrooms. (Click to select) d. A light-bulb firm is the first to produce and market super-efficient laser-based lighting. (Click to select) e. A rival toy maker introduces a new Stacie doll to compete with Mattel's Barbie doll. (Click to select)