What is the process that allows mixing the combinations of genes in a single chromosome, resulting in a virtually infinite possible combination of genes?

Question

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Crossing over is the process in which homologous chromosomes exchange segments of genetic material during meiosis. This allows for the mixing and shuffling of genes, resulting in a virtually infinite possible combinations of genes in each chromosome. Sampling from a large genetic pool (A) can contribute to genetic diversity, but it does not directly allow for the mixing of combinations of genes within a single chromosome. Gamete swapping (B) is not a known biological process. Mitosis (D) is a process of cell division that does not involve the mixing of genetic material from different chromosomes.

What Is the Process That Allows Mixing the Combinations of Genes