Which of the following is a true statement about integrated circuits?

Integrated circuits (ICs) encompass a wide range of functionalities and technologies. The statement that they include both TTL (Transistor-Transistor Logic) and PLC (Programmable Logic Controller) families is accurate because integrated circuits can be designed to support various logic families and programmable functionalities. TTL is a specific type of digital circuitry that utilizes bipolar junction transistors, while PLCs are used for automation and control applications, often incorporating both digital and analog components within an IC format. This versatility allows integrated circuits to serve many purposes across different applications, from simple logic operations to complex programmable systems.

The other options mischaracterize the range and capabilities of integrated circuits. For instance, not all integrated circuits are limited to only using transistor-transistor logic or lack programmable logic controllers, nor are they primarily analog devices, as there are many digital ICs prevalent in modern electronics. By stating that integrated circuits encompass both TTL and PLC families, option C accurately reflects the diversity and application of integrated circuits in the field.