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(a) if the threshold amount for a fiscal year of the person exceeds $1,000,000, the end of the first fiscal quarter in that fiscal year,
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(b) if the threshold amount for the second or third fiscal quarter in a fiscal year of the person exceeds $1,000,000, the end of the first fiscal quarter in that year for which the threshold amount exceeds $1,000,000, and
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(c) if the purchase threshold for a fiscal year of the person exceeds $4,000,000, the end of the first fiscal quarter in that fiscal year.