All four of them.
They are all so happy with themselves in this picture- they climbed up to the top of a staircase that ends in a wall. You can't tell how high the stairs go, or what a nice view you had from up there. You can see, a bit, how nice the sunshine felt, and how novel, two months ago. Already, though, we are getting used to the warmth and the sun up on our mountain.
Two- or three- months ago, Spring was a promise almost met, and now Summer is making itself felt.