Based on the code segment below and by using cstring and/or cctype functions, write C++ statements to perform each of the following instructions. Note that, each question is dependent. Important: Please write C ++ statements WITHOUT blank spaces unless it is absolutely needed. Example: int num,a,b; 1 char str1[10] = "always"; char str2[10] = "smile"; 3 char str3[15]; 4 int len; 2 a) Concatenates str2 string to the end of strl string. b) Copy the resulting string in (a) into str3. c) Store the length of str3 into len. }; d) Converts str3 string to lowercase by filling in the blanks in the code segment below with an appropriate statement. for (int x = 0; ; x++)