During the Opening Takbir (Tahrimah), how should the fingers of the hands be positioned according to the Sunnah?

The Sunnah Acts of Prayer (سنن الصلاة) Part 1: Preparation & Posture

• They is Sunnah to be tightly closed together.
• They is Sunnah to be spread apart as wide as possible.
• They is Sunnah to be kept in their natural, relaxed state (Nashr al-Asabi').
• They is Sunnah to be folded into a fist.