Hi Everyone: I deleted my post. You are correct, I mis-read the article. I also believe the Sponsor signs off on the charter. In my previous experience, the sponsor typically is from senior management. (They have held the purse strings in the companies I have worked for and are the only ones authorized to initiate projects). So, with that example, hypothetically both are correct.
In Andy Crowe's book, The PMP Exam, How to Pass on Your First Try (5th edition), it does explicitly state the the Project Charter is signed by the performing organization's senior management (Pg. 57) I don't think I've helped answer the question, only to spur further debate. It would be great if someone could come in and clearly articulate this.
Thanks...Tracey