why is the answer both a and d in this question? I thought it was only a:

Which of the following regarding dose-response curves is false?

1. A higher ED₅₀ is associated with greater potency
2. Therapeutic index (TI) is calculated by dividing the TD₅₀ by the ED₅₀
3. At E_max all receptors are assumed to be saturated
4. Reversible competitive antagonists prevent a drug from reaching E_max inthe presence of excess agonist
5. Both A and D 

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