Final answer:
Incremental innovation refers to small improvements to existing products using existing technologies targeted at existing markets. The correct option is D.
Step-by-step explanation:
The type of innovation that focuses on improving an existing product by using existing technology and targeting existing markets is known as incremental innovation.
This form of innovation involves making small changes or improvements to products or services that already exist, rather than introducing entirely new concepts or disrupting the market.
Incremental innovation aims to enhance efficiency, productivity, and competitive differentiation within an existing market structure, often leading to a series of small but significant changes over time.