Teacher:In this task, you need to provide the correct option for a given problem on probability from the provided options.
Teacher: Now, understand the problem? Solve this instance: Problem: in how many ways 2 boys and 2 girls can be seated in a row so that boys and girls are alternate ? 
Options: a ) 7 , b ) 8 , c ) 9 , d ) 10 , e ) 11
Student:
b