The application's I/O profile is doing random I/O. Which action must you perform to disable automatic read ahead on the related filesystem? 

Use the command newfs with the "read_ ahead=0” option on the filesystem 

Mount the filesystem with the “readahead=random” option 

Use the command vxtunefs to set the "read_ ahead=0" option on the filesystem. 

Mount the filesystem with the "mincache=tempcache" option