Which of the following is the world's oldest currency still in use?

Which of the following is the world's oldest currency still in use?

مندرجہ ذیل میں سے کون سی دنیا کی قدیم ترین کرنسی اب بھی استعمال میں ہے؟
Explanation
British Pound is the world's oldest currency still in use. It is 12,000 years old.