Given the code below, which of the following statements is correct? I class Box { double width; double height; double depth; double volume) { return width height * depth; } } The class is missing the main() method. It will give a syntax error. The code shows a simplified general form of a class definition. There are missing components. The class is unusable. The variable declarations are wrong. Variables can be declared only inside methods. Below is an example using the new operator st1 = new Student(); Which of the options below is wrong? declares a reference for the object st1 allocates memory for an object called st1 returns a reference for the object st1 public initial() { System.out.println(this.name.substring(0, 1)); } A constructor should initialize (give a valid value to) all the variables in a class O only the public variables in a class all the attributes in a class O only the private variables in a class