You are given two different length strings that have the characteristic that they both take exactly one hour to burn. However, neither string burns at a constant rate. Some sections of the strings burn very fast, other sections burn very slow. All you have do is calculate when exactly 45 minutes has elapsed? A.    1. Light both ends of the first string         2. Light end of the second string at the same time.         3. When the first string is finished burning,         4. Light the unlit end of the second string. B.    1. Light both ends of the second string         2. Light beginning of the first string at the same time.         3. When the first string is finished burning,         4. Light the unlit end of the second string. C.    1. Light end of the first string         2. Light end of the second string at the same time         3. When the first string is finished burning,         4. Light the unlit end of the second string.  D. None of these