The correct answer is Option 1: Electric plane tested by NASA.

`Greased Lightning-10 (GL-10)` is an electric plane that has recently been in the news due to its testing by NASA. The GL-10, also known as the `Greased Lightning` or the `GL-10 Valkyrie,` is an experimental aircraft developed by NASA`s Langley Research Center. It is a vertical takeoff and landing (VTOL) aircraft that can transition between hover and forward flight, making it a unique and versatile aircraft.

The GL-10 is powered by 10 electric motors that are mounted on its wings and can tilt to provide both vertical and horizontal thrust. This allows the aircraft to take off and land like a helicopter, but also fly efficiently like a traditional airplane. The electric propulsion system of the GL-10 is designed to be more environmentally friendly and efficient compared to traditional aviation fuel-powered aircraft.

The GL-10 has been in development since 2013 and has undergone several rounds of testing by NASA. The aircraft has been tested in various configurations, including different wing designs and propulsion systems, to optimize its performance. The recent news about the GL-10 likely pertains to the latest testing and evaluation of the aircraft`s capabilities.

The GL-10 has potential applications in various fields, including remote sensing, cargo delivery, and passenger transportation. Its unique VTOL capabilities make it suitable for operations in areas with limited or no runway infrastructure, such as rural or remote locations. Additionally, the electric propulsion system of the GL-10 has the potential to reduce emissions and noise pollution, making it an environmentally friendly option for future aviation.

In conclusion, the `Greased Lightning-10 (GL-10)` has recently been in the news as an electric plane tested by NASA. It is a unique aircraft with vertical takeoff and landing capabilities powered by electric motors, and it has the potential for various applications in the aviation industry.