In the basic Keynesian framework, how is the aggregate supply curve typically depicted?

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Sloping downward throughout all output levelsRising steadily across every output levelFlat up to the full capacity point, then vertical beyond thatVertical up to full capacity, then flattening outNone of the above

Explanation

In the simple Keynesian model, the aggregate supply curve is shown as perfectly elastic (horizontal) until the economy reaches its full production capacity. After this point, the curve becomes perfectly inelastic (vertical), indicating no further increase in output despite rising prices.