Which type of contact refers to interactions that are sporadic and unpredictable?

The type of contact that refers to interactions that are sporadic and unpredictable is indeed best described as random. Random contact occurs without a set pattern or predictability, meaning that these interactions can happen at any time and are not established based on regularity. This aligns with the definition of sporadic encounters where the timing and occurrence of contact are not planned or systematic.

Regular, intentional, and frequent contacts, on the other hand, imply a level of consistency and predictability in interactions. Regular contact occurs at established intervals, intentional contact is purposeful and planned, and frequent contact happens often without gaps in time. Therefore, each of these types of contact implies a level of predictability that random contact does not possess.