Which statement about the turmeric paper test for borate is correct?

1. APaper turns blue on wetting with the acidified solution, and red when moistened with dilute NaOH.
2. BPaper turns reddish-brown on wetting with the acidified solution and decolourises on moistening with dilute NaOH.
3. CPaper remains yellow with the acidified solution, and turns red when moistened with dilute NaOH.
4. DPaper wetted with the acidified borate solution and dried turns reddish-brown, and the stain turns dark bluish-black when moistened with dilute NaOH.