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Which of these is the correct sequence of crosses that Mendel used to arrive at the dihybrid 9:3:3:1 ratio? to get F2, and analyse F2 ratios

Question
Which of these is the correct sequence of crosses that Mendel used to arrive at the dihybrid 9:3:3:1 ratio? to get F2, and analyse F2 ratios
Cross two pure-breeding parents differing in two traits to get F1, then self-pollinate F1
Cross F2 plants directly without ever forming F1
Only observe wild, unrelated pea plants with no controlled crosses
Cross the same parent with itself only once and stop
Answer
Cross two pure-breeding parents differing in two traits to get F1, then self-pollinate F1
Detailed Explanation
Mendel's dihybrid method involved crossing two pure-breeding (homozygous) parents differing in two traits to produce F1, then self-pollinating F1 to generate and analyse the F2 generation's ratios.
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