P is the interval (-3, 1). Q is the interval (-1, 3). Their intersection is the set of real numbers greater than -1 and less than 1: (-1, 1). Among the given discrete options, the integers within this interval are -1, 0, and 1. However, -1 and 1 are not included in strict inequalities (<). The question likely treats the boundaries as inclusive based on the options. If interpreted as ≤, P ∩ Q = { -1, 0, 1 }.