A developer is using a technique to improve the reliability of a language model's output. For a single request to summarize a text about cellular biology, the model generates the four different one-sentence summaries listed below. After processing these four candidates, the system selects 'Summary A' as the final output.

• Summary A: The mitochondrion is the cell's power plant, generating ATP through cellular respiration.
• Summary B: Often called the powerhouse of the cell, the mitochondrion produces the energy currency, ATP.
• Summary C: The primary role of the ribosome is to synthesize proteins for the cell.
• Summary D: The mitochondrion, known as the cell's powerhouse, is responsible for creating ATP.

Based on the provided summaries and the final selected output, which combination method was most likely used to aggregate the candidates?

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