Given the code fragment:
String name = "Spot";
int age = 4;
String str ="My dog " + name + " is " + age;
System.out.println(str);
And
StringBuilder sb = new StringBuilder();
Using StringBuilder, which code fragment is the best potion to build and print the following string My dog Spot is 4
A. sb.append("My dog " + name + " is " + age); System.out.println(sb);
B. sb.insert("My dog ").append( name + " is " + age); System.out.println(sb);
C. sb.insert("My dog ").insert( name ).insert(" is " ).insert(age); System.out.println(sb);
D. sb.append("My dog ").append( name ).append(" is " ).append(age); System.out.println(sb);
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