When unloading a semiautomatic pistol, which of the following steps should be taken?

Removing the magazine, pulling the slide back, and inspecting the chamber is the correct sequence for unloading a semiautomatic pistol. The first step of removing the magazine ensures that no further ammunition can be fed into the chamber from the magazine itself. After the magazine is removed, pulling the slide back serves to eject any round that may be chambered, allowing the user to visually inspect the chamber to confirm that it is empty. This thorough process helps ensure safety by preventing any possibility of the firearm discharging after it is assumed to be unloaded.

Other options do not incorporate the necessary steps to verify the firearm is fully unloaded. For example, putting the safety on is good practice but does not substitute for the need to physically remove the ammunition. Pulling the hammer back is not relevant in the context of unloading as it does not address the need to remove ammunition from the chamber or magazine. Similarly, pulling the slide back before removing the magazine does not allow for the complete verification of the chamber's status. The comprehensive approach in the correct answer promotes safe handling and ensures that the firearm is cleared properly.