Please help me with these 2 questions. Thank you!

* Types of elements and keys: Which types are possible for the elements and keys of containers? map can have a string as its key. map can have a struct as its key. map can have a struct as its element. set can have a struct as its element. vector can have a struct as its element. x Incorrect Question 90/2 * Indexing a container: Both vector and map have method at for indexing. How does this method differ in these containers? The type of the parameter passed to at of map can be any of the following ones: int, float, string. The type of the parameter passed to at of vector can be unsigned int. The compiler informs about an error, if the value of the parameter passed to at of vector is negative. It is not necessarily an error, if a negative value is passed to at of map. Incorrect