Q: Trial runs are recommended for which of the following reasons? 1. Trial runs provide an opportunity to remedy the situation during the experiment. 2. Trial runs provide a final chance to fine-tune levels of a factor. 3. Trial runs provide a chance to make any needed changes in the experimental plan during the experiment. 4. Trial runs can help considerably in estimating the time to complete a run, the logistical support required for level changes, and total time needed to complete an experiment. Select the correct answer using the code given below :