With reference to Visible Light Communication (VLC) technology, which of the following statements are correct? 1. VLC uses electromagnetic spectrum wavelengths 375 to 780 nm. 2. VLC is known as long-range optical wireless communication. 3. VLC can transmit large amounts of data faster than Bluetooth. 4. VLC has no electromagnetic interference. Select the correct answer using the code given below:
A
1, 2 and 3 only
B
1, 2 and 4 only
C
1, 3 and 4 only
Correct Answer
D
2, 3 and 4 only
Explanation
Option (c) is correct because VLC utilizes the visible light spectrum (375–780 nm), provides significantly higher data transfer speeds than Bluetooth, and is immune to electromagnetic interference as it uses light instead of radio frequencies. Statement 2 is incorrect because VLC is a short-range technology limited by line-of-sight and the inability of light to penetrate walls, making "long-range" factually inaccurate. The core concept tested is the operational principles and technical advantages of Li-Fi (Light Fidelity) technology.
Information TechnologyVisible Light Communication (Li-Fi)Visible Light CommunicationVLCelectromagnetic spectrum375-780 nmlong-rangeBluetoothdata transmissionelectromagnetic interference