Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
j _ m b _ a _ _ u _ b _ a d j _ m _ b _ d
1
u b m j m b u b a
2
u b d j m b j b a
3
u b d j m b u b a
4
u b d j m b u m a
5
u b m j d b j b a