Q$3(4$ marks$)$: Suppose the s$1$ and s$2$ are two strings given as follows:

String s$1=$ "Welcome to Java";

String s$2=$ new String$("$Welcome to Java"$)$;

What are the results of the following expressions?

a$.s1==s2$

b$.$ s$1.$equals$($s$2)$

c$.$ s$1.$replace$("$o$",$ "abc"$)$

d$.$ s$2.$replaceFirst$("$e$","$xyz$")$