Select the option that contains a grammatical error in the underlined portion.

I have dialled the number so many times I know it at heart.

1
I have dialled the number so many times I know it at heart.
2
I have dialled the number so many times I know it at heart.
3
I have dialled the number so many times I know it at heart.
4
I have dialled the number so many times I know it at heart.

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