Question: Given a problem of navigating through a 2 D grid to reach a goal and assuming no obstacles, which of the following heuristics is admissible?

Given a problem of navigating through a 2D grid to reach a goal and assuming no obstacles, which of the following heuristics is admissible?
The number of turns made so far in the path.
The number of squares in the entirety of the grid.
The number of squares left to reach the goal regardless of direction.
Twice the straight-line distance from the current node to the goal.

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