In order to ensure best read performance， which of the following indicates how large an application’s read buffer size should be if the filesystem to be read is striped across N disks using LVM striping？（）

A. N times the stripe unit size
B. N times the VMM minfree parameter
C. The same value as that of the VMM maxfree parameter
D. The same value as that of  the VMM maxrndwrt parameter