Answer & Explanation
Option: It is a cross-platform centralized encrypted messaging service.
Explanation:
Signal is a cross-platform centralized encrypted messaging service developed by the Signal Technology Foundation and Signal Messenger LLC. The non-profit Signal Foundation was launched in 2018 with initial funding of $50 million from Brian Acton. It uses the Internet to send one-to-one and group messages, which can include files, voice notes, images and videos. It can also be used to make one-to-one and group voice and video calls.
