Final answer:
It is not possible to determine which functions are solutions without knowing the specific differential equation.
Step-by-step explanation:
The question is asking which of the given functions are solutions of a differential equation. Unfortunately, the specific differential equation is not provided in the question. Without the differential equation, it is not possible to determine which functions are solutions. To identify solutions, the differential equation itself must be known and each of the given functions can be tested by substituting them into the equation and verifying if they satisfy it.