Given the tree, identify and draw the subtrees rooted at nodes a, C, and E.

Based on the provided image of the rooted tree, here are the subtrees rooted at a, C, and E.

a) Subtree rooted at a:
The subtree rooted at 'a' is the entire tree itself, as 'a' is the root of the given tree.

$$\begin{array}{ccccccccc} & & & & a & & & & \\ & & / & | & \backslash & & & \\ & b & & c & & d & \\ / & \backslash & / & \backslash & / & | & \backslash \\ e & f & g & h & i & j & k \\ & / | \backslash & & / \backslash & & / \backslash & \\ & l \ m \ n & & o \ p & & q \ r \\ & & & & & / \backslash & \\ & & & & & s & t \\ & & & & & & | \\ & & & & & & u \end{array}$$

b) Subtree rooted at C:
The subtree rooted at C includes C itself and all its descendants.

$$\begin{array}{ccc} & C & \\ / & \backslash & \\ G & & H \\ & / & \backslash \\ & O & P \end{array}$$

c) Subtree rooted at E:
The subtree rooted at E includes E itself and all its descendants. Since E is a leaf node in the original tree, its subtree consists only of E.

$$E$$