Which example is best described as a start$-$up company?

NoConcussion is a company that manufactures equipment to be placed inside football players'

helmets to prevent concussions.

MeID is a company that uses sophisticated blockchain technology to provide ID verification for all

human beings based on their individual physiological $($biometric$)$ characteristics, such as

fingerprints and eyeball scans.

A New Leash on Life is a company that creates and sells diamond$-$studded leashes for dogs owned

by the world's wealthiest people.

Live or Die is a vacation company that specializes in dropping people off in remote locations with no

supplies, and forcing them to live off the land or die trying.