Question: Which regular expression correctly represents the set of all strings over { 0 , 1 } that contain at least one 1 ?

Which regular expression correctly represents the set of all strings over {0,1} that contain at least one "1"?
1u(0u1)**
((0**1)**1)**
(10**)**1**
(01**)**1(01)1**
Which regular expression correctly represents the

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