What is the primary difference between exaptation and adaptation in evolutionary biology?

Exaptation is a trait developed due to genetic mutations, while adaptation is a trait developed due to environmental pressures.

Exaptation is a trait that remains unchanged over time, while adaptation involves continuous evolution.

Adaptation occurs without the influence of natural selection, whereas exaptation is driven by natural selection.

Exaptation involves a trait evolving for one function and later being co-opted for another, while adaptation involves a trait evolving specifically for its current function.