[C++11]: To prevent class objects from being copied or assigned, you can:

a. Declare as private the class’s copy constructor and overloaded assignment operator.
b. Declare the class’s copy constructor and overloaded assignment operator with with = delete after the parameter
list.
c. Simply do not declare a copy constructor or assignment operator in the class.
d. (a) or (b).

d. (a) or (b).