How to specify metric thread with major diameter 45mm, 2mm pitch, grade 7, tolerance grade h (internal thread), right hand double start threaded profile?

How to specify metric thread with major diameter 45mm, 2mm pitch, grad

1.	How to specify metric thread with major diameter 45mm, 2mm pitch, grade 7, tolerance grade h (internal thread), right hand double start threaded profile?
A.	M 45*2-7-H-RH-DOUBLE
B.	M 45*2-7-h-RH-DOUBLE
C.	M 45*2-7-H-LH-DOUBLE
D.	M 45*7-2-H-RH-DOUBLE
Answer» B. M 45*2-7-h-RH-DOUBLE