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Which of the following is NOT a difference between Blu-ray disc and DVD?

A) The quality of audio and video recorded on Blu-ray disc is higher than DVDs.

B) Read only memory type is not available in Blu-ray disc whereas DVD supports read only memory,       

C) Blu-ray disc uses violet-blue laser, whereas DVD uses red laser.

D) A single layer blu-ray disc can store upto 25 GB data whereas a single layer DVD can store only 4.7 GB of data.