Active king

Although in the opening and middlegame the king is vulnerable to attack and must be hidden away behind a fortress of pawns, in the endgame he takes on the role of attacker. 

Once there is no longer a danger of the king being attacked, he should rush into action, heading for the centre of the board, or to attack weak points in the enemy position... chessstrategyonline.com

Diagram - White to move the king to which square ?

😎 Tournaments - 2022 Kavala Open, Greece