All of the Following Statements Are True Except

All of the following statements are true except:

A) Metric bolts can be identified by the grade number on the top of the bolt heads.
B) Measuring units of standard bolts use a fractional number-based system.
C) Standard bolts can be identified by the hash marks on the top of the bolt heads.
D) Measuring units of metric bolts use a roman number-based system.