Need help with venting a Shower and Tub

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New Jersey
I am installing a shower and tub in a line along the same wall. The shower drains into a trap drain goes four feet to pick
up the tub trap drain, then travels another four feet to a 3" drain going straight down, which vents thru 3" vent thru the
roof. How should I vent the shower/tub vent line. Option 1 before the shower trap? Option 2 after the shower trap. or
Option 3 just before the tub trap. All of which will vent thru the roof
Hey, wait a minute.

This is awkward, but...

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