To answer this question, it is important to understand the purpose and functionality of the readLine() method in Java.
The readLine() method is used to read a line of text from an input source, such as a file or the console. It returns the line of text as a string. This method is commonly used for user input, where the user can enter text in the console.
However, the readLine() method itself does not directly lead to any security attacks such as SQL Injection, Cross-Site Request Forgery (CSRF), or other similar attacks.
Option A) SQL Injection attack - The readLine() method does not have any direct relation to SQL Injection attacks. SQL Injection attacks occur when an attacker is able to manipulate SQL queries by injecting malicious code into user inputs that are used in SQL statements. To prevent SQL Injection attacks, it is important to use prepared statements or parameterized queries when executing SQL statements.
Option B) Denial of Service (DoS) attack - This is the correct answer. The readLine() method itself does not lead to Denial of Service attacks. However, if the program using the readLine() method does not implement proper input validation and handling, it may be vulnerable to DoS attacks. For example, if the program does not limit the amount of data that can be read using readLine(), an attacker could potentially flood the input source with a large amount of data, causing the program to consume excessive resources and resulting in a denial of service.
Option C) CSRF attack - The readLine() method is not directly related to Cross-Site Request Forgery attacks. CSRF attacks occur when an attacker tricks a user into performing unwanted actions on a website in which the user is authenticated. CSRF attacks exploit the trust that a website has in a user's browser. To prevent CSRF attacks, web applications typically use tokens to verify the authenticity of requests.
Option D) None of these - This option is incorrect, as explained above.
In summary, the readLine() method in Java itself does not lead to SQL Injection or CSRF attacks. However, if proper input validation and handling are not implemented, it may make a program vulnerable to Denial of Service attacks. Therefore, the correct answer is B) Denial of Service attack.