A.A runtime exception is thrown.

B.Peter
Julia

C.A compilation error occurs.

D.Julia
Peter

A.for(int idx = 1; idx < arr.length; idx+=2) {
System.out.print (arr[idx]);
}

B.for(int idx = 0; idx < arr.length; idx++) {
System.out.print (arr[idx]);
}

C.for(int idx = 0; idx < arr.length; idx+=2) {
System.out.print (arr[idx]);
}

D.for(int idx = 1; idx < arr.length-1; idx++) {
System.out.print (arr[idx++]);
}

A.java.io

B.java.math

C.java.util

D.java.lang

A.line 7

B.line 2

C.line 3

D.line 5

A.The commands:
javac Student.java
java Student Richard William Java
are used to print Richard William is studying Java.

B.The commands:
javac Course.java
javac Student.java
java Course
java Student "Richard William" Java
are used to print Richard William is studying Java.

C.The commands:
javac Student.java
java Student "Richard William" Java
are used to print Richard William is studying Java.

D.The commands:
javac Student.java
java Student Richard William Java
throw an error about a missing Course.class file.