Which one of the following is not a way to improve the P/Q rating of a company's brand of UAV drones?

A. Increasing expenditures for free online pilot training programs made available to all buyers of the company's drones

B. Improving the caliber of the built-in GPS/Wi-Fi/Bluetooth components

C. Improving the caliber and functionality of the camera stabilization device (so that video quality is not so adversely affected by strong wind conditions)

D. Decreasing the number of models in the company's line-up and improving the quality of the obstacle sensors

E. Improving battery life to permit more minutes of flying time on a single charge