The correct answer is D. The IPS Blade must be activated on the individual Security Gateway object .
Check Point Software Blades are enabled on the enforcement point that inspects traffic, which is the Security Gateway or Cluster object, not merely on the Management Server. The official Threat Prevention guide states that to enable IPS, the administrator opens the Security Gateway / Cluster object , goes to General Properties > Network Security , selects IPS , and follows the wizard. For IPS package installation, Check Point also documents the sequence: enable IPS in the Security Gateway object, enable IPS in the corresponding Threat Prevention policy, and install the Threat Prevention Policy.
Licensing alone is therefore insufficient; a license permits use, but blade activation defines whether the gateway enforces IPS inspection. Option A is wrong because enabling the blade on the Management Server object does not activate IPS enforcement on all managed gateways. Option C is also wrong in standard ClusterXL management because blades are configured on the Cluster object, not separately and inconsistently on individual members. Operationally, enabling IPS on the correct gateway or cluster object ensures SmartConsole exposes the appropriate Threat Prevention controls and that policy installation targets the enforcement points. Reference topics: IPS Blade activation, Gateway object configuration, Threat Prevention policy installation, Cluster object management.