Sony Started as a Tiny Company That Built Portable,battery-Powered Transistor

Multiple Choice

Sony started as a tiny company that built portable,battery-powered transistor radio.The sound quality was poor,but customers were willing to overlook that for convenience and portability.With the experience and revenue stream from these portable radios,Sony improved its technology to produce cheap,low-end transistor amplifiers that were suitable for home use,and invested those revenues in improving the technology further,which produced still better radios.This is an example of:

A) Sustaining technologies.
B) Disruptive technologies.
C) Web 3.0.
D) Digital Darwinism.