Which of the following is NOT an optical disk?

Which of the following is NOT an optical disk?

مندرجہ ذیل میں سے کون آپٹیکل ڈسک نہیں ہے؟
Explanation

A floppy disk is a magnetic storage device, not an optical disk.

CD, DVD, and Blu-ray Disc are all optical storage media, read using laser technology.