Whereas productions are documents a student prepares especially for a portfolio, attestation represent a teacher's documentation of a student's progress, such as through notes or progress reports.
Attestation is a statement that something exists or is true.
Attestations are records of a student's progress kept by a teacher or other responsible person. An instructor might, for example, write evaluation notes regarding a student's oral presentation and keep them in the portfolio.
Thus, the correct option is attestation.
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