A. true b. false: a vector object automatically expands in size to accommodate the items stored in it.

Answer : True  

Explanation: Vectors can hold, data of the same type and can automatically expand accordingly and change it’s size. The date stored in vectors should be linear.  

-The syntax for vector is vector<int>v;

-Mostly this is used in C++ as an alternative to arrays  

-If you want to use vector in your program then define it in the header first  i.e.

#include <vector>

-Push back is a function, that is used to insert an element into the vector  

-Pop back removes the element from the vector