Suppose after selling an XYZ December 50 call for \(\$ 3\) when the stock was at \(\$ 50\), the price of the stock increases to \(\$ 55\). Assume at the \(\$ 55\) stock price, the December 50 call is trading at \(\$ 6\) and there is an XYX December 55 call available that is trading at \(\$ 2.50\). Believing that \(\mathrm{XYZ}\) stock will stay at \(\$ 55\) at least until expiration, show how you could change your current unprofitable position to a potentially profitable one by implementing a rolling-credit strategy. How would your collateral requirements change?