Tommy Rowe, Craig Mackail-Smith and Grant McCann all scored goals for the Posh in the second half.
Ferguson told Sky Sports, when asked if this was his best moment in football: “Easily. Absolutely fantastic day.
“I’m so proud of them. To win 3-0 in a final is a great result.
“The one thing we showed today is we dug in when we were under pressure. That’s been the key.
“Keeping clean sheets, digging in, showing composure.”
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.