Which of the following is true in terms of Firmware?

(A). Firmware refers to software permanently installed in a device, machine, or microchip by the manufacturer. 

(B). In a Datamation article in 1967, Ascher Opler introduced the term "firmware" as a link between "hardware" and "software."

(C). Low-level firmware:  Referring to a semi-independent unit within a larger system, this category incorporates microcodes similar to high-level firmware, thus displaying characteristics akin to a system.

(D). High-level firmware: Designed for use with flash memory chips, this type of firmware allows for updates and modifications.