Consider a predator encountering two prey types P1 and P2. Assume the energy value of P1 is greater than that of P2. Assume also that the search time to find each prey type is inversely proportional to its abundance in the habitat. The prey-choice model in optimal foraging theory evaluates whether the predator should specialise on P1 or generalise to feed on both P1 and P2. This model predicts specialising on P1 when:
\[
\frac{E_1}{S_1+h_1} > \frac{E_2}{h_2}
\]
where \(E_1\) is the energy value of P1; \(h_1\) is handling time for P1; \(E_2\) is the energy value of P2; \(h_2\) is handling time for P2; \(S_1\) is the search time for P1. According to the condition given above, which one or more of the following options does the decision to specialise on P1 depend on?