$(8)$ Learning curve effect as measured by Texas Instrument:

A$)$ Is graphed with average unit cost over time and time$/$cumulative volume from Texas Instrument over time.

B$)$ Graph$/$Relationship is a specific functional$/$statistical form$/$distribution$.$

C$)$ Is caused by learning about the processes, parameters, technologies, and tools.

D$)$ All of the above.

E$)$ A and C