Assume $q1$ is a queue created in the main and $q2$ is created in a block scope and we write $q2=q1$ and in the main function we print the items of the $q1,$ if no operator$=$

overload method then then

a$.$ The q$1$ was not changed

b$.$ The q$1$ has the same items of q$2$

c$.$ The q$1$ becomes empty

d$.$ The q$1$ items becomes rubbish