Which statement about lossless data compression is NOT true?

Which statement about lossless data compression is NOT true?

• A. Reduces file size without losing information.
• B. Allows exact restoration of the original data after decompression.
• C. ZIP is an example of lossless compression.
• D. Lossless compression discards some data to reduce size.

Answer: (D)

Lossless data compression reduces file size without losing any information. It works by encoding data more efficiently so that, when you decompress, you can recreate the exact original data bit-for-bit. A real-world example is ZIP, which uses lossless compression to shrink files without any loss of detail. The statement that lossless compression discards some data is not true because discarding data would prevent an exact reconstruction and is what happens in lossy compression, where some information is permanently removed to achieve smaller sizes.

Lossless data compression reduces file size without losing any information. It works by encoding data more efficiently so that, when you decompress, you can recreate the exact original data bit-for-bit. A real-world example is ZIP, which uses lossless compression to shrink files without any loss of detail. The statement that lossless compression discards some data is not true because discarding data would prevent an exact reconstruction and is what happens in lossy compression, where some information is permanently removed to achieve smaller sizes.