假设在目录myprj/src/school中有Java源文件Student.java,编译后的类文件出现在目录myprj/classes/school中,应该使用下列哪一个命令来执行这个类?()  
A、cd myprj/src java ../classes school.Student
B、cd myprj/src/school java –cp ../classes school.Student
C、cd myprj/src/school java –cp ../../classes school.Student
D、cd myprj/src java –cd ../classes school.Student