Why Is the Razor-And-Razor-Blade Model Also Known as the Printer-And-Ink

Multiple Choice

Why is the razor-and-razor-blade model also known as the printer-and-ink model?

A) The technique is only used by printing companies.
B) The razor blade is not used that much today,whereas printers are ubiquitous.
C) The printer is sold at a low cost,but ink or toner is priced much higher.
D) Printers are expensive,but ink is readily available.