Derivative A has the following Greeks today: ?A = 0, νA = 0.3 and ΓA = 1.1.
Derivative B has the following Greeks today: ?B = 0, νB = 0.4 and ΓB = 2.
You write a derivative X with the following Greeks today: ?X = 300, νX = 120 and ΓX = 48.
All three derivatives are for the same underlying asset.
What position should you take in the underlying asset, derivative A, and derivative B to be delta- gamma-, and vega-neutral today?