Given this cоde tо reаd in а file nаmed a.txt, what dо we know about the structure of the content in a.txt? Assume that fileIn is an open pointer to a file. 1 char str1[ 20 ], str2[ 20 ]; 2 int num; 3 while( fscanf( fileIn2, "%s %d %s", str1, &num, str2 ) == 3 ) 4 { 5 printf( "%s %d %sn", str1, num, str2 ); 6 }