To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) Compilation error - This option is incorrect. The given code will not result in a compilation error because it follows valid syntax. The code initializes an integer variable a1 with the value 5 and then assigns its value to a double variable a2 after performing a type cast.
Option B) Runtime error - This option is incorrect. The given code will not result in a runtime error because there is no invalid operation or division by zero involved. The code simply performs a type cast from an integer to a double.
Option C) Runtime exception - This option is incorrect. The given code will not result in a runtime exception because there is no exceptional condition or error that would cause the program to terminate abruptly.
Option D) No error - This option is correct. The given code will execute without any error. It initializes an integer variable a1 with the value 5 and then assigns its value to a double variable a2 after performing a type cast.
The correct answer is D. No error. This option is correct because the code will compile and execute without any errors or exceptions.