Choose the option that describes correctly sufficiency of information "a" and "b" for answering the question, 'How is M related to R?
a. A's brother, F, who is the only son of his parents, is married to W, who is M's sister.
b. W and F have a only daughter R.
1
"a" alone is sufficient
2
Both "a" and "b" are sufficient
3
Either "a" or "b" is sufficient
4
Neither "a" nor "b" is sufficient