If a long tail is a dominant characteristic, in which case is the characteristic of a long tail definitely expressed?

Question

Responses

when neither allele contains instructions for a long tail
when neither allele contains instructions for a long tail

when at least one allele contains instructions for a long tail
when at least one allele contains instructions for a long tail

when both parents have a long tail
when both parents have a long tail

when at least one parent has a long tail

Answer 1

when at least one parent has a long tail