To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) Compiler error - This option is incorrect because there is no compiler error in the given code. The code compiles successfully.
Option B) FileNotFoundException thrown at line 1 - This option is incorrect because the FileNotFoundException is not thrown at line 1. The code attempts to create a new file "bb.txt" if it does not exist.
Option C) IOException thrown at line 2 - This option is incorrect because the IOException is not thrown at line 2. The code successfully writes the integer value "1" to the file.
Option D) None of these - This option is correct because there is no compiler error, FileNotFoundException, or IOException thrown in the given code. The code compiles successfully, creates a new file "bb.txt" if it does not exist, and writes the integer value "1" to the file before closing it.
The correct answer is D. None of these.