What made it easy for outsiders to crack and use the organization's WLAN initially?

The option indicating that the WLAN allowed users to connect to the Internet using the same password is correct because it implies a vulnerability in network security practices. Using a shared or commonly known password across multiple access points or services can significantly reduce the security of a wireless network. This approach can make it easier for unauthorized users to gain access because if the password is known or easily guessed, individuals outside the organization can connect without any strong barriers to unauthorized entry.

In contrast, passwords should be unique and complex to deter potential breaches. The other options highlight technical aspects of encryption and security protocols but don't directly connect to the overarching issue of password management and accessibility that can lead to easy exploitation by outsiders.