Which of the following pair of acronyms and its expansion is incorrectly matched?

Correct option is A

(a) MIDI - Musical Instrument Digital Interchange: This is incorrect. The correct expansion of MIDI is Musical Instrument Digital Interface, which is a technical standard that describes a protocol for communication between musical instruments and computers.
(b) LED - Light Emitting Diode: This is correct. An LED is a semiconductor device that emits light when an electric current passes through it.
(c) MPEG - Motion Pictures Experts Group: This is correct. MPEG is a working group that sets standards for audio and video compression and transmission.
(d) PDF - Portable Document Format: This is correct. A PDF is a file format developed by Adobe to present documents in a manner independent of software, hardware, or operating systems.
Information Booster:
1. MIDI: Widely used in digital music production for connecting electronic instruments and recording software.
2. LED: Used in lighting, displays, and indicators due to its efficiency and durability.
3. MPEG: Developed standards like MPEG-1 (MP3 audio), MPEG-2 (DVDs), and MPEG-4 (streaming videos).
4. PDF: A popular document format for preserving formatting and enabling secure sharing across devices.