Biblical question about Jacob and Esau?

In Genesis 27, notice that the more favorable paternal "blessing" was Isaac's, to give to whomever (if anyone) he wanted to give it to; consequently, neither of his sons was legally "entitled" to a greater or lesser "blessing" from Isaac their father -- that is why Isaac (not Esau) is deemed the real "fraud victim", technically, in Genesis chapter 27, -- and that is why Isaac is the one who has the fraud victim's right of "election". Notice how Isaac reacted when he learned that he had been tricked by Jacob's behavior: did Isaac (A)"rescind" the fraud-tainted transaction and thus withdraw the "blessing" from Jacob (and then re-convey that same "blessing" to Esau), --- or did Isaac (B)"ratify" the fraudulent transaction? Please explain why you chose A or B. Thank you for your help.