What output is produced by the following code fragment?

```
String m1, m2, m3;
m1 = "Quest for the Holy Grail";
m2 = m1.toLowerCase();
m3 = m1 + " " + m2;
System.out.println(m3.replace('h', 'z'));

```

The output produced is:
Quest for tze Holy Grail quest for tze zoly grail
The original string is concatenated with a lowercase version of itself, then all lowercase ‘h’ characters are replaced with ‘z’.