Which of the following messages passed to the String str could throw a StringIndexOutOfBoundsException?

A$.$ str$.$replace$($a$\text{'}$; $\text{'}$A$)$;

B$.$ str$.$equals$($str$)$;

C$.$ str$.$charAt$(2)$;

D$.$ any of the above could throw a StringindexOutOfBoundsException

E$.$ str$.$length$()$