9) Which of the following properly define(s) the C-string containing "Hello" ? Explain why the incorrect option(s) do not work properly a) char stringvar[10] = "Hello"; b) char stringvar[10] = {'H', 'e', 'I', 'I', 'o'); c) char stringvar[10] = {'H', 'e", 'I','I', 'o", "O'); d) char stri ngvar(7)-"Hello"; e) char stringvar[] = "Hello"; f) char stringvar[5] = "Hello"; 10) In the following code fragment: char s [20], i[25], t [30]; cout>t; cout