The security questions can be obtained from apple support advisors Contact Apple for support and service - Apple Support , condition you must be aware of three answers for respective questions , the Apple ID account can be opened when you reveal all answers to them , and that should be verified through them .
You can also see the steps .
If you forgot security questions use a web browser and open iforgot.apple.com and enter your Apple ID , click on continue .
Check the box of I need to reset my security questions , click on continue and enter your Apple ID password .
Again click on continue then check the box of answer your security questions you choose when Apple ID was created and click on continue .
A security question will be written in the field , you can click on drop down arrow the three questions that you created when apple id was created will be visible .
In your case account is locked .
( a ) If you lose answers for Apple ID provide credit card details that was added in the account .
( b) Support pin is used by apple support advisors to verify the account when you know apple id password Generate a temporary Support PIN - Apple Support