What is initialization method in Spring?

I am studying for the Spring Core certification and I have the following dount on this question:

What is an initialization method and how is it declared in a Spring bean?

My doubt is: is it this question refered to the @PostConstruct annotation (in case of annotation based config) or the init-method attribute (in case of the XML configuration), so something like this:

@PostConstruct
public void setup() {
    ...
}

and

<bean id=“accountService” class=“com.acme.ServiceImpl” init-method=“setup”>
    ...
</bean>

Or is it refered to something else that now I am missing?