Digital data storage units – UGC NET Question

Statements A, C and D correctly describe data storage units in the binary system used in many ICT contexts. Kilobyte is commonly approximated as 1024 bytes when referring to memory, and a gigabyte is conventionally treated as 1024 megabytes in the same binary sense. A bit is indeed the smallest unit of data in a computer. Statement B is wrong because one megabyte is smaller, not larger, than one gigabyte, so the correct set of true statements is A, C and D only.

Option A:
Option A is incorrect because it includes only statements A and C while omitting D. Statement D is also true, as one gigabyte is usually taken as 1024 megabytes when using binary-based measurement. Excluding a true statement leads to an incomplete identification of correct statements.

Option B:
Option B is correct because it groups exactly the true statements A, C and D. Together they explain the hierarchical relationship between bit, byte, kilobyte, megabyte and gigabyte in ICT. No false statement is included in this combination, which matches the requirement to select all correct statements.

Option C:
Option C is incorrect because it includes B, C and D as correct. While C and D are true, statement B is false since an MB is smaller than a GB. Incorporating a false statement into the combination means this option cannot be accepted.

Option D:
Option D is incorrect because it assumes that all four statements are correct. Statement B incorrectly reverses the size relationship between megabyte and gigabyte. Since a single false statement is enough to disqualify the combination, this option is not correct.