When an attorney receives information that the opposing side has sent accidentally, that attorney has four options:

1. to refrain from reading the information, and then to contact the opposing attorney and return the document unread;
2. to read the information, contact the opposing attorney, and return the document;
3. to read the information, contact the opposing attorney, and refuse to return the document; or
4. to read the information and use it.

Given our adversarial system and your own sense of justice, which approach do you think is best? Please explain your reasoning