Which of the following risk strategies can be used to ensure a positive risk is realized?

Accept is a strategy for both positive and negative risks where no action is taken to change the risk's outcome; if it's an opportunity, you simply hope it occurs.

Enhance is a strategy for positive risks that involves increasing the probability and/or impact of an opportunity, but it does not necessarily ensure it is realized, unlike 'exploit'.

Share is a strategy for positive risks where the ownership of an opportunity is assigned to a third party best able to capture the opportunity for the benefit of the project, which is not about ensuring realization by the project team directly.

Exploit is a strategy for positive risks (opportunities) where the project team acts to ensure that the opportunity is realized, often by removing any uncertainty associated with it or allocating resources to make it happen.