When playing an upstroke/strum....is it more appropriate to only play the highest 3 strings on an upstroke/strum...or should you try to play through all the strings and try to mute the low strings? My confusion is easpecially with the D chord. Should I try to mute the low E and A with my thumb...or should I try to only play the highest 3 strings when doing an upstroke/strum?

Or....do I try to play all 4 strings on a D upstroke/strum and somehow not strum the low E and A?

Thank you!!!