Identify the statement that describes lossless compression.
Mark scheme
- C No data is lost and the original file can be recreated (1)
- The only correct answer is C. The correct answer is no data is lost and the original file can be recreated.
- A is not correct because encryption hides data and does not make the file smaller
- B is not correct because permanently removing data is lossy compression
- D is not correct because splitting a file into packets is part of transmission, not compression
Example answers and how they were marked
Full marks1/1
C No data is lost and the original file can be recreated
Why: Correct option (1).
No marks0/1
B Data is permanently removed to make the file smaller
Why: Near miss: this is lossy compression, not lossless, so no mark.
No marks0/1
D The file is split into packets that are sent separately
Why: Misconception that compression is packet switching; no mark.