Synchronous and asynchronous communication – UGC NET Question

Statements A, B and C capture the defining characteristics of synchronous and asynchronous communication. Video conferencing is synchronous because all participants interact in real time, and synchronous communication generally requires participants to be online together. Email is asynchronous because messages can be sent and read at different times. Statement D is wrong because asynchronous communication, by definition, does not require everyone to be online at the same time, so the correct combination is A, B and C only.

Option A:
Option A is correct because it includes precisely the three true statements A, B and C. Together they distinguish real-time interaction in video conferencing from time-shifted interaction in email and highlight that synchronous modes require simultaneous online presence. No false statement is included in this set, which matches the requirement of the question.

Option B:
Option B is incorrect because it restricts the set of correct statements to A and C only, omitting B. Statement B is a correct description of email functioning as an asynchronous communication tool where messages can be read later. Excluding B therefore fails to identify the full set of correct statements about synchronous and asynchronous communication.

Option C:
Option C is incorrect because it includes D along with B and C. While B and C are true, statement D is false as asynchronous communication does not require all participants to be online at the same time. By adding a false statement into the combination, this option cannot be considered correct.

Option D:
Option D is incorrect because it considers all four statements to be correct. Asynchronous communication is explicitly characterised by the absence of a requirement for simultaneous online presence, which contradicts statement D. Including this wrong statement alongside the three true ones invalidates the combination.