The header over an opening in a wall made of 2 × 6 studs consists of
a. thrE 2-by lumber members nailed together.
b. thrE 2-by lumber members nailed together with one intervening filler.
c. thrE 2-by lumber members nailed together with two intervening fillers.
d. two 2-by lumber members nailed together with thrE intervening fillers.
e. two 2-by lumber members nailed together with two intervening fillers.
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