Which of the following is correct? Data mining bias is when we exclude certain firms from our analysis because they are no longer in business Time period bias is likely when studying the performance of self-reporting groups such as hedge funds that are not required to disclose data but may do so voluntarily Out of sample testing occurs when the test is based on a time period that may make the results time period specific Loolishead bias occurs when information that was not available on the test date is used in estimation None of the other answers are correct