Which character-handling library function converts lowercase letters to uppercase letters? a) lowertoupper b) isupper c) touppercase d) toupper The general utilities library is a) stdutil b) stdlibrary c)stdutily d)stdlib Function _______ inputs the next character from the standard input and returns it as an integer. a) inputchr b)getchr c)inputchar d)getchar Keyaord _____ introduces the structure definition. a)structure b)str c)strdet d)struct Function fscanf cannot be used to read data from the standard input You must explicitly use fopen to open the standard input, standard output, and standard error streams. A program must explicitly call function fclose to close a file If the file position points to a location in a sequential file other than the beginning of the file, the must be closed and reopened to read from the beginning of the file Function fprintf can write to the standard output Data in sequential-access files is always updated without overwriting other data It's not necessary to search through all the records in a random-access file to find a specific record Records in random-access files are not of uniform length Function fseek may seek only relative to the beginning of a files An array can store many different types of values. An array index can be of data type double. It's an error if an initializer list contains more initializers than there are array elements A pointer that's decaled to be void can be dereferenced Pointers of different types may not be assigned to one another without a cast operation