Which Shape In This Puzzle Is The Odd One Out?

Which Shape In This Puzzle Is The Odd One Out?

Can you solve the odd-one-out shape logic puzzle? You have a lineup of shapes. The first is a red square with a black outline, next is a red square with no outline, next is a red circle with a black outline, next is a green square with a black outline, and the last shape is a small red square with a black outline. Which of these shapes is the odd one out? Logic puzzles like this are difficult because they all seem odd enough to be the outlier.

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