LED (Light-Emitting Diode) Bulbs, Such as the Cree LED Bulb

LED (light-emitting diode) bulbs, such as the Cree LED bulb, have been available for only a few years in low lighting levels (lumens) . They are designed to replace incandescent and compact fluorescent lightbulbs, in part because of a federal law that phases out incandescent lightbulbs in favor of more energy-efficient ones. LED bulbs will last up to 20 years. In what stage of the product life cycle is this product?

A) growth stage
B) decline stage
C) accelerated development stage
D) introduction stage
E) maturity stage