According to the table shown below, which of the following best describes the change in to between 2009 and 20ſo? Sales of mobile phones Year 500 B901 800 300 C005 1200 1500 2009 2010 2011 400 600 2000 400 Select the single best A. decreased by 250 B. decreased by 300 C. increased by 250 D. increased by 500 hane​

Consider the following statements: struct nametype{string first; string last; }; struct coursetype{string name; int callnum; int credits; char grade; }; struct studenttype{nametype name; double gpa; coursetype course; }; studenttype student; studenttype classlist[100]; coursetype course; nametype name; mark the following statements as valid or invalid. if a statement is invalid, explain why. a.) student. course. callnum = "csc230"; b.) cin > > student. name; c.) classlist[0] = name; d.) classlist[1].gpa = 3.45; e.) name = classlist[15].name; f.) student. name = name; g.) cout < < classlist[10] < < endl; h.) for (int j = 0; j < 100; j++)classlist[j].name = name; i.) classlist. course. credits = 3; j.) course = studenttype. course;