Read the passage and then answer the question that follows:

the least weasel is the world's smallest carnivore. despite its size, it is surprisingly fierce. its bravery and hunting skills are well documented. on several occasions, it has been known to kill prey up to ten times its own size. all things considered, it may just be the toughest predator on land.

in the passage about the least weasel, which transition is used to summarize an idea?

all things considered
are well documented
on several occasions
surprisingly