Sketch the Entity-Relationship diagram for each of the following business needs. Each semester, a number of courses (but not all courses) are offered. Any given course might or might not be offered and, if offered, could be offered a number of times in the semester. Each course offering is uniquely identified by a CRN (course requirement number). Other information regarding the course offering includes: cycle (i.e. Monday-Wednesday-Friday, Tuesday-Thursday, etc), starting time (i.e. 8:00 am), duration (i.e. 50 minutes) and semester (i.e. Fall 2014).