'Forty-four segments.' The Professor beamed at him

‘Forty-four segments.’ The Professor beamed at him.
(a) ‘Beamed’ in the above line means…
(b) What is the topic of discussion?
© What does the above remark reveal about the Professor?

(a) to smile very happily
(b) The Corporal was lecturing on a grenade and informed the trainee soldiers that it was divided into a large number of segments to help in fragmentation.
© It shows that he is neither ashamed nor embarrassed in whatever he does or says, not even in front of the toughest of officers like Corporal Turnbull.