Which statement about the java object is true?

a.All objects created by a program will remain in the computer memory till the program is terminated.

b.Objects can communicate with each other through either public or private methods.

c.A java program must declare at least one object in order to be executed.

d.Objects must work together and can't do any tasks alone.

e.Objects are the building blocks of OOP and can only contain private data and methods.