Quad Sum Sudoku (Daily Sudoku League #35)

My last post in The League of Extraordinary Ladies and Gentlemen named "Non-Consecutive Sudoku" was a tough one. So I am putting an easy puzzle in this post as Quad Sum Sudoku. 
This Quad Sum Sudoku is my 35th contribution to The League of Extraordinary Ladies and Gentlemen. Can you solve this Quad Sum Sudoku puzzle?

Quad Sum Sudoku Rules

Classic Sudoku Rules apply. Additionally, a circle at a corner implies that 1 digit is the sum of the other 3 digits around that corner.
Quad Sum Sudoku (Daily Sudoku League #35)
Quad Sum Sudoku (Daily Sudoku League #35)

Non Consecutive Sudoku (Daily Sudoku League #34) Solution
Non-Consecutive Sudoku (Daily Sudoku League #34) Solution

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