$($Choose only $1$ answer$)$ What is an advantage of polymorphism?

a$.)$ Variables can be re$-$used in order to save memory.

b$.)$ The same program logic can be used with objects of several related

types.

c$.)$ Constructing new objects from old objects of a similar type saves

time.

d$.)$ Polymorphism is a dangerous aspect of inheritance and should be

avoided.