I would use a biometric machine that scans a fingerprint and a eye retina then calls up my bank information from the scan. Who wants to carry a card around anyway?
The CPU is the working principle
The correct answers are:
<span>E-commerce platformsMobile
Applications
Online point-of-sales systems
Source and explanation: https://goo.gl/guJKC9
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A small hard drive typically has only one platter, but each side of it has a magnetic coating. Bigger drives have a series of platters stacked on a central spindle, with a small gap in between them. The platters rotate at up to 10,000 revolutions per minute so the read-write heads can access any part of them.
