$(30\%)$ Comparing with one$-$factor authentication, two$-$factor authentication provides more protection to the user identity in online services. Please compare three different types of currently available techniques for second factor with regarding to

$($a$)$ Password cracking

$($b$)$ Eavesdropping

$($c$)$ Loss of second factor

$($d$)$ Trojan horse or Key logging

$($e$)$ Men$-$in$-$the$-$Middle prevention