Final answer:
The 1572 form should be completed and signed by the PI before the beginning of the study. For participants, informed consent must be read and signed before they take part in an experiment.
Step-by-step explanation:
The form 1572 must be completed and signed by the Principal Investigator (PI) before the start of the study. It is a critical requirement in clinical research to ensure that the PI agrees to the responsibilities and has reviewed all necessary details to conduct the study in line with regulatory guidelines. As with all regulatory documentation, the timing of its completion is essential to meet compliance standards and protect the integrity of the trial.
Regarding the question about what individuals should read and sign before participating in an experiment, the correct answer is a. informed consent. Informed consent is a process that ensures participants are fully aware of the study's purpose, procedures, risks, benefits, and their rights as participants, providing them with the information necessary to make an educated decision about their involvement in the research study.