In an input validation error, the input received by a system is not properly
checked, resulting in a vulnerability that can be exploited by sending a certain input sequence. There are two important types of input validation errors: buffer overflows (input received is longer than expected input length) and boundary condition error (where an input received causes the system to exceed an assumed boundary). A race condition occurs when there is a delay between the time when a system checks to see if an operation is allowed by the security model and the time when the system actually performs the operation. In an access validation error, the system is vulnerable because the access control mechanism is faulty. In an exceptional condition handling error, the system somehow becomes vulnerable due to an exceptional condition that has arisen.
Source: DUPUIS, Clement, Access Control Systems and Methodology CISSP Open Study Guide, version 1.0, march 2002 (page 105).

If there is no support by management to implement, execute, and enforce
security policies and procedure, then they won't work. Senior management must be
involved in this because they have an obligation to the organization to protect the assests .
The requirement here is for management to show "due diligence" in establishing an
effective compliance, or security program.
The following answers are incorrect:
The tech support team. Is incorrect because the ultimate responsibility is with management
for the security of computer-based information systems.
The Operation Team. Is incorrect because the ultimate responsibility is with management
for the security of computer-based information systems.
The Training Team. Is incorrect because the ultimate responsibility is with management for
the security of computer-based information systems.
Reference(s) used for this question:
OIG CBK Information Security Management and Risk Management (page 20 - 22)