Detailed Explanation:

Answer: Option 4 — 1, 2 and 3

Wearable technology devices are capable of performing all three mentioned tasks through integrated sensors and connectivity features. Modern wearables combine GPS, biometric sensors, and audio processing capabilities to assist users in various ways.

✅ Statement 1 – Correct: Smartwatches and fitness trackers with GPS functionality can identify and track a person's real-time location for navigation, safety, and fitness tracking purposes.
✅ Statement 2 – Correct: Wearable devices equipped with accelerometers and heart rate sensors can monitor sleep patterns, including duration, stages (REM, deep, light sleep), and overall sleep quality.
✅ Statement 3 – Correct: Hearing aid wearables and some smartwatches can amplify sounds and process audio to assist hearing-impaired persons by improving sound clarity and volume.

📝 Short Notes: Wearable Technology

• Definition: Electronic devices worn on the body that incorporate sensors, processors, and wireless connectivity to collect data and provide services.
• Common Types: Smartwatches, fitness trackers, smart glasses, hearing aids, health monitors, and smart clothing.
• Key Features: Real-time health monitoring (heart rate, blood oxygen, ECG), GPS tracking, notifications, activity tracking, and biometric authentication.
• Health Applications: Continuous glucose monitoring for diabetics, fall detection for elderly, stress monitoring, and remote patient monitoring.
• Technology Components: Sensors (accelerometer, gyroscope, heart rate, GPS), Bluetooth/Wi-Fi connectivity, battery management, and companion mobile apps.
• Examples: Apple Watch, Fitbit, Google Glass, Cochlear implants, Samsung Galaxy Watch, and Garmin fitness trackers.