Section 10(37) is neither a blanket exemption nor a blanket tax; it is a conditional relief, so testing the options against that conditional structure resolves the question.
Since the exemption exists but is conditional rather than absolute, and none of the other three descriptions correctly captures that conditional character, the option describing exemption subject to prescribed conditions is correct.
The four options represent four different positions on a spectrum, an absolute tax rule, a conditional exemption, a threshold-based rule, and a business-income characterisation, and lining them up against what Section 10(37) actually does shows only one of them survives.
Once the absolute-tax, threshold-based, and business-income positions are set aside as inconsistent with how Section 10(37) is actually drafted, the conditional-exemption description remains as the correct legal position.
Therefore, the correct answer is it is exempt, subject to fulfilment of prescribed conditions.
Match List-I with List-II: 