A multinational company is having problems with its password$-$based security system and is considering using a biometric based authentication system. What biometric systems could the company employ? What are some of the factors it should consider when deciding among various biometric systems? Over the years, it has been claimed that biometric technology can easily replace the password$-$based authentication used in real digital world and, if this is true, why are we still using passwords for authentication? Explain your answer with proper justification