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Which of these correctly summarises the genotypic outcome of a Tt x Tt self-cross?

Question
Which of these correctly summarises the genotypic outcome of a Tt x Tt self-cross?
1 TT : 1 Tt : 2 tt
1 TT : 2 Tt : 1 tt
2 TT : 1 Tt : 1 tt
4 TT : 0 Tt : 0 tt
Answer
1 TT : 2 Tt : 1 tt
Detailed Explanation
A Tt x Tt cross yields offspring genotypes in the ratio 1 TT : 2 Tt : 1 tt, as per the Punnett square.
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