Question: What happens after execution of the following code? a = [ 1 , 2 , 3 ] b = [ 4 , 5 , 6

What happens after execution of the following code?
a=[1,2,3]
b=[4,5,6]
a.append(b)
The code has an error.
a contains [1,2,3,4,5,6]
a contains [1,2,3,[4,5,6]]
a contains [1,2,3,b]
What happens after execution of the following code? a=[1,2,3] b=[4,5,6] a.append(b)

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