Question: For a subscriber with the Explicit Call Transfer (ECT) service in their Home Location Register (HLR), which of the following combinations of logical states is INVALID according to the specified storage requirements?
Option 1: Provisioning State: Provisioned, Registration State: Registered, Activation State: Active and Operative, HLR Induction State: Not Induced
Option 2: Provisioning State: Not Provisioned, Registration State: Not Applicable, Activation State: Not Active, HLR Induction State: Not Induced
Option 3: Provisioning State: Provisioned, Registration State: Not Applicable, Activation State: Active and Operative, HLR Induction State: Induced
Option 4: Provisioning State: Provisioned, Registration State: Not Applicable, Activation State: Not Active, HLR Induction State: Not Induced
Explanation: The correct answer is Option 1 because for the Explicit Call Transfer service, the 'Registration State' is always 'Not Applicable'. In Option 1, the Registration State is listed as 'Registered', which contradicts this requirement. All other options adhere to the stated conditions.