Explain the aswer please.

a The word intention is such that four of its prefixes, 4, in, intent and intention themselves. Write a function that takes in a pointer to the root of a trie storing a dictionary returns the maximum number of words that are prefixes of a single word. Use the struct d function prototype given below. typedef struct TrieNode { struct TrieNode *children [26]; int flag; // 1 if the string is in the trie, o otherwise } TrieNode; int max (int a, int b) { if (a > b) return a; return b; } int maxNumPrefixWords (TrieNode* root) { if (root == NULL) return 0; // 2 pts int maxChild = 0; int i; for (i=0; ichildren[i])); // 4 pts, 3 pts for rec call, 1 for updating max return maxChild + root->flag; // 2 pts