Answer the following questions for the tree shown in Fig. 12.28.

(a) Which vertices are the leaves?
(b) Which vertex is the root?
(c) Which vertex is the parent of g?
(d) Which vertices are the descendants of c?
(e) Which vertices are the siblings of s?
(f) What is the level number of vertex f?
(g) Which vertices have level number 4?

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b.