State the nature of below instruments in terms of Negotiable Instruments Act, 1881 and also state its validity:

i. Pay Rs. 100,000 to Asad along with mark-up of Rs. 10,000 three months from today;

ii. I admit that I have obtained Rs. 50,000 from Imran and will pay the interest to him on the amount at agreed interest rate;

iii. I promise to pay Waleed USD 10,000 alongwith applicable interest;

iv. Pay ______________________ or bearer.