1. For the following Trees, tell whether they are valid Red and Black trees or not. If not, point out which property the tree violates. The nil leaves are not drawn for convenience. (Please note that a node with double circles indicates black, and a node with single circle indicates red) 50 65 61 7 8 12 54 10 41 27 92 97 50 65 (iv) 50 65 61 7 8 10 12