A. Message Queue Telegram Transport
B. Message Queue Telemetry Transport
C. Message Queuing Telemetry Transport
D. Message Queuing Telegram Transport

Solution

C. Message Queuing Telemetry Transport

Explanation

MQTT stands for Message Queuing Telemetry Transport. It is a lightweight and open messaging protocol designed for small sensors and mobile devices, optimized for high-latency or unreliable networks. MQTT is commonly used in scenarios where devices need to communicate with each other over a network, and it is widely used in the Internet of Things (IoT) for connecting devices and enabling efficient communication between them.