When photons meet and reflect from a surface and are then detected after they reflect ...

Pick those that are true

		1. they appear to take, on the average, a path with the least travel time
		2. they take all possible paths, including into the material, and the resultant sum depends on the frequency of the light
		3. they behave like solid projectiles and bounce off the surface precisely as given by the law of reflection
		4. the direction in which they go is given as a probability, not a certainty