Python

For the code shown below, the line numbers are added for your reference: 1. def maybeAdd(a,b): 2. for let in a: if let not in b: 4. b.append(let) 3. What does the code above do? It adds to a, elements of of b that are not already in a It adds all elements of a into b It adds all elements of b into a It adds to b, elements of of a that are not already in b