ASME gives several recommendations for lettering. Which one among the following list is not part of those considerations?

a$.$ All dimension numerals, notes, and other lettered information should be the same height.

b$.$ The spacing of letters in words should be such that the individual letters are uniformly spaced.

c$.$ Notes should be lettered horizontally on the sheet.

d$.$ The minimum lettering size is $\mathrm{.}125mm$ on engineering drawings.