Dear Sanjay
When any law is made it does not specifically cover lot of fine nitty gritties but they have to be evoved by referring to teh legislative intent while bringing that law. The reason is very simple! People who are making the laws decide that there is a need to make law on a particular subject tbut they hardly are the right people with teh right knowledge
The negotiable Instruments Act is one such pice of legislation
Now for example when this Negotiable Instruments Act sections related to teh Cheques were introduced, they covered only 1 reason "Insufficieny of Funds" and due to this lot of accused tried to take advantage by making Stop Payments, Signature Differrence, Closing teh Account etc
If u go by the strict defenition or the condition then to attract Section 138 only teh Insufficiency of funds was a valid reason but if that logic is accpted the purpose of the Act would be defeated so teh SC gave teh interpretation of teh Act and covered almost every rason for cheque bounce in Section 138 quoting legislative intent as teh basis!
Had the Act been drafted by a team of Senior Bankers and Lawyers it would have been a different thing and then they would have probably included every possible reason that was later on added by teh SC
Rearding the 15 days period Section 138 (c) of teh Act uses teh words "within fifteen days of the receipt of the said notice." It is silent upon teh other eventuality i.e. What happens when teh Notice is not recieved!
The word notice in general use in Law means when it comes to your knowledge. And when does a Regd AD being returned comes to your knowledge? When you recieve it back!
So what u have answered is correct. As u sadi "My assumption is safter date to consider is D, "
Regarding your first question the answer is simple
Whne you obtained thecheque from teh Company it must be doing its business from a particular place! Sending a notice at that address is sufficient!