A ___ is a type of programmable controller. I. PLR II. PBC III. PAC

• A. I & III only
• B. I only
• C. I & II only
• D. II only

Answer: (A)

Understanding the different families of programmable controllers helps here. A Programmable Logic Relay is a compact controller that combines relay logic with a programmable element, so you can load a program to control basic on/off logic—definitely a type of programmable controller. A Programmable Automation Controller is a more advanced class that blends PLC-style control with PC-like features for complex tasks, networking, and data handling—also a programmable controller.

PBC isn’t considered a standard programmable controller category in this context, so it isn’t counted as a true type alongside PLR and PAC. That’s why the correct combination is PLR and PAC only.