Cedar Clapboard Nailing Questions

Hello,
Regarding the typical Cedar horizontal siding clapboards: Having some new ones put up.
a. These days, what size nails are typically used ?
b. What type of head ?
c. Are they usually countersunk (at all) ? If so, is some kind of putty used to fill void ?
Thanks, B.
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Stainless siding nails.
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