Pick and copy all the incorrect options for the following question:

Which procedure best helps to determine whether an investigation is scientifically valid?

Options:
- keeping notes on the condition of equipment used in the procedure
- conducting an investigation with a group of people
- conducting the procedure thoroughly one time
- repeating an investigation several times



- keeping notes on the condition of equipment used in the procedure



- conducting an investigation with a group of people



- conducting the procedure thoroughly one time



