30. Having o inelude in one's code a. provides the declaration of cout. b. allows one to write cout rather than std: s cout c. a and b d. Include has nothing to do with cout 31. Having using namespace std in one's code a. is always required b. permits cout to be used c. allows one to write cout rather than std: : cout. d. has nothing to do with cout 32. Not having a garbage collector a. is why Ct+ has a delete operator b. means dangling pointers are a concern in Ct+ c. means memory leaks are a cause for concern in Ct+ d. a and b e. a and c