Identify with reasons, which form of dischargement is taking place in the following scenarios:

(a) Tooba contracted to deliver to Saad at his house, on 15th April, 6 kgs of Flour freshly pierced wheat. Tooba delivers the same on time and receives her cash.

(b) Messi promises Ronaldo to sell and deliver 80 kgs of potatos on 15th April at his godown. Ronaldo promises to pay for the potatoes on 30th April. Messi fails to deliver the potatoes

. (c) Serena took a loan from Marium amounting to $100,000 payable in August 2020. In June 2020, Serena was declared bankrupt by High Court of Sindh.

(d) A music hall was rented by Jonas brothers for a series of Qawali events. The Hall caught fire before the date of first event.

(e) Imran sold goods to Nawaz amounting to Rs. 10,000. Payment is due on 30th April 2020. On day of payment Nawaz couldn't pay.