29. The lengths of the three sides of a triangle $a, b, c$ are all integers, and $[a, b, c]=60,(a, b)=4,(b, c)=3$. Then the minimum value of $a+b+c$ is ( ).
Note: $[a, b, c]$ represents the least common multiple of $a, b, c$; $(a, b)$ represents the greatest common divisor of $a, b$
(A ) 30
( B ) 31
( C ) 32
(D) 33
Reference answer: B