How does this Push-Pull amplifier work? (3 Solutions!!)

How does this Push-Pull amplifier work?

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With thanks & praise to God, and with thanks to the many people who have made this project possible! | Content (except music & images) licensed under CC BY-SA https://meta.stackexchange.com/help/licensing | Music: https://www.bensound.com/licensing | Images: https://stocksnap.io/license & others | With thanks to user Sumanth (electronics.stackexchange.com/users/106363), user G36 (electronics.stackexchange.com/users/92635), user Colin (electronics.stackexchange.com/users/93461), user Bart (electronics.stackexchange.com/users/82170), user Autistic (electronics.stackexchange.com/users/70314), and the Stack Exchange Network (electronics.stackexchange.com/questions/309936). Trademarks are property of their respective owners. Disclaimer: All information is provided "AS IS" without warranty of any kind. You are responsible for your own actions. Please contact me if anything is amiss at Roel D.OT VandePaar A.T gmail.com