Which of the following syllogisms is valid ?

Which of the following syllogisms is valid?

All human beings have three legs; Tom is a human being; therefore, Tom has three legs.

All Denver Broncos are smart; all Denver Broncos are strong; therefore, all football players are smart and strong.

Joan likes Frank Sinatra; Jill likes Christina Aguilera; therefore, Jill dislikes Frank Sinatra.

All Finns have beards; Mikko is a Finn; therefore, all Finns are named Mikko.