The default Flex direction is:

Question

BlackTom AI · Accepted Answer

The question asks about the default Flex direction. 
Option 1: 'Column' — This would set elements to lay out vertically, but it is not the default; the standard default is horizontal alignment, so this is incorrect.
Option 2: 'Row' — This matches the well-established default in CSS Flexbox, where items are placed in a row from left to right unless otherwise specified. Therefore this is the correct baseline behavior.
Option 3: 'row-reverse' — This would reverse the order of the row, placing items from right to left, but only if explicitly set; it is not the default. Thus this is incorrect as a description of the default.
Option 4: 'column-reverse' — This would orient items in a vertical column that flows bottom-to-top, which again requires an explicit setting and is not the default.
In summary, the default flex-direction is a row-oriented layout, not column or a reversed variant, so among the options, 'Row' correctly identifies the default behavior.

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