Massallah pertaining to a woman in Iddah and receiving proposals

As’salaamu’alaikum Mufti Saheb
Could assist me with the following:

A) Is it permissible to talk about a future spouse to a lady while she is sitting in her iddat? What form of Act is this regarded as?
B) What happens while in Iddat, a Lady considers the future proposal & after her iddat she reads Istikharah & performs Nikkah? What form of Act is this?

C) How soon can a lady have proposal offers while she is in iddat?
Your Advice is much appreciated.
May we take Heed, Aameen?
Jazakallah.