Rice 的M.Stat Specializations 是什么意思

看到官网上讲学生可以从

[size=11.875px]Applied Statistics for Industry
[size=11.875px]Financial Statistics and the Statistics of Risk
[size=11.875px]Bioinformatics, Statistical Genetics, and Biostatistics
[size=11.875px]Statistical Computing and Data Mining
[size=11.875px]Environmental Statistics [size=11.875px]Joint MBA/M.Stat Degree Program
[size=11.875px]Preparation for Ph.D. Studies in Statistics, Mathematical Economics, and Finance
这几个方向选课，想问下这个意思是选定某个感兴趣的方向后不变了，还是可以从多个方向选课，申请的时候需要说明吗？