Avery thought his new math teacher was cold and ineffective. but by the end of the year, he liked him. this is an example of the:

Awaiver of the requirement for documentation of informed consent may be granted when: the investigator has no convenient place to store signed consent forms separate from the research datathe only record linking the subject and the research is the consent document and the principal risk is a breach of confidentiality. potential subjects might find some of the research questions embarrassing, personal, or intrusivethe subjects are literate in their own language; however, they do not read, write, or speak english

These are pieces of information that are not necessarily the meaning or purpose of writing

Can someone me answer all the questions?