The set of all strings over ∑ = {a,b} in which all strings having bbbb as substring is?

* bbbb (a+b)*b) (a+b)* bb (a+b)*bb

(a+b)* bbbb (a+b)*b) (a+b)* bb (a+b)*bbc) bbb(a+b)*d) bb (a+

The set of all strings over ∑ = {a,b} in which all strings having b

1.	The set of all strings over ∑ = {a,b} in which all strings having bbbb as substring is?
A.	(a+b)* bbbb (a+b)b) (a+b) bb (a+b)bbc) bbb(a+b)d) bb (a+
B.	* bbbb (a+b)b) (a+b) bb (a+b)*bb
C.	bbb(a+b)*
D.	bb (a+b)*
Answer» B. * bbbb (a+b)b) (a+b) bb (a+b)*bb