1. The return-type used in String operations are. a) void only b) void and (char *) only c) void and int only d) void, int and (char *) only AnswerAnswer: d [Reason:] None. 2. String operation such as strcat(s, t), strcmp(s, t), strcpy(s, t) and strlen(s) heavily rely upon. a) Presence of NULL character b)…