(a) Define counter-offer and enumerate any FOUR methods of terminating an offe

(a) Define counter-offer and enumerate any FOUR methods of terminating an offer.

(b) Chief Obelawo and Otunba Dawodu are prominent businessmen residing at Ibadan and Kano respectively. On 1 August 2009 Chief Obelawo phoned Otunba
Dawodu to make inquiries about the availability of certain chemical components required in one of his factories and requested that the terms of the sale be
posted to him as soon as possible. On 3 August Otunba Dawodu caused a letter of offer in respect of the goods to be posted to Chief Obelawo which was
received on 15 August 2009 and he immediately replied. The letter of acceptance was duly posted on 16 August 2009. In the meantime a very close personal
and business friend of Otunba Dawodu in Kano required the same type of chemical components urgently and the Otunba sold all the available ones to him on 9
August 2009. On the second day 10 August 2009 Otunba Dawodu sent a letter of revocation of the offer to Chief Obelawo. The letter of Chief Obelawo?s
acceptance was received on 25 August 2009 while the Chief Dawodu?s letter of revocation was received on 20 August 2009.

You are required to determine whether or not there was a valid and binding contract between Chief Obelawo and Otunba Dawodu.