a) vector <int> :: const_iterator itr = v.rbegin();
b) vector <int> :: reverse_iterator itr = v.begin();
c) vector <int> :: iterator itr = v.begin();
d) vector <int> :: iterator itr = v.cbegin();
Meghna MittalBegginer
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a) vector <int> :: const_iterator itr = v.rbegin();
b) vector <int> :: reverse_iterator itr = v.begin();
c) vector <int> :: iterator itr = v.begin();
d) vector <int> :: iterator itr = v.cbegin();
c
Explanation: v.rbegin() returns itertor of reverse iterator therefore cannot be stored in const_iterator(type mismatch). Similarly v.begin() returns normal iterator therefore cannot be stored in reverse_iterator and v.cbegin() returns the const_iterator therefore cannot be stored in normal iterator.