Imagine a researcher named Carl is planning to do his doctoral dissertation on how eagle attacks affect the behavior of a troop of 40 monkeys Based on previous research, Carl anticipates that, although he will study the monkey froop for about 20 weeks, he will probably only be present for something like 310 eagle attacks during his entire study. What kind of sampling rule should Carl use to study how monkeys respond to eagle attacks?
O. Scan
O. Focal
O. Behavior
O. Ore-zero