Based on the tree below, which statement is correct?
A phylogenetic tree of four species. The main branch divides into two branches 2 a and 2 b. Branch 2 a leads to salamander. Branch 2 b divides into two branches 3 a and 3 b. Branch 3 a leads to lizard. Branch 3 b divides into two branches that lead to goat and human.
Lizards and goats form a sister group.
Goats and humans are the only sister group shown in this tree.
Salamanders are a sister group to the group containing lizards, goats, and humans.
Salamanders are more closely related to lizards than to humans.