Write the next sentence in the following story.

How to prepare a paper presentation
Know the requirements.
Each presentation for each class is going to be a bit different. Some instructors will be happy with 3 minutes while others will demand you stand there awkwardly for 7.

Pick from:
i. But today, the teacher will tell you that 45 minutes should be enough. Write down your goals for the test followed by the time you will have to sit for the exam.
ii. Have all the guidelines clear when you go to write your presentation. Know how long the speech must be.
iii. Figure out what you need ahead of time in preparation so you know what to expect. Make sure you have copies of all your assignments already, and retain these in case you forget.
iv. This doesn't necessarily mean the professor won't be happy to see you, however. Submit the required materials in your professor's office and stick by them.. The answer should be
ii.