security cameras las vegas

How Las Vegas casinos to increase security after 9 / 11? (Multiple choice question)?
Hey, this is part of my study guide for the exam and can not find the answer if you are …. of course, the answer please answer! A.) Has the security cameras in the area outside casinos. b) security has allowed casino personnel to carry a concealed weapon. c) using the technology of retinal scanning when they enter a casino d.) using a software Fingerprint recognition of Thanks to all spectators entering a casino!
A and B are correct, but the B has always been the case, but not all employees Casino weapon wear, there are always some who are, this number is increasing. C and D shall not happened and probably never happens.
Las Vegas Casino: Hardcore Security