Which bacterial phenotype would have the highest fitness if it were cultured in a medium containing antibiotics?

Question

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In a medium containing antibiotics, the bacterial phenotype that would have the highest fitness would be the highly antibiotic-resistant variant. The antibiotic-sensitive variant would not be able to grow in the presence of the antibiotics, and the slightly and moderately antibiotic-resistant variants may have reduced growth rates due to the presence of the antibiotics. However, the highly antibiotic-resistant variant would be able to grow and reproduce at a higher rate, giving it a higher fitness advantage.

Which Bacterial Phenotype Would Have the Highest Fitness If It