Question: How can a MnS (Management and Network Services) Consumer cancel subscriptions at a MnS Producer, considering the 'consumerReference'?
Option 1: By providing only the 'consumerReference', all subscriptions across different producers will be cancelled.
Option 2: By providing the 'subscriptionId' alone, without referencing the 'consumerReference', a specific subscription can be cancelled.
Option 3: A MnS Consumer can cancel either one specific subscription by providing both the matching 'consumerReference' and 'subscriptionId', or all subscriptions tied to a single 'consumerReference' by omitting the 'subscriptionId'.
Option 4: Subscription cancellation is not possible if the 'consumerReference' is unknown or missing, regardless of having the 'subscriptionId'.
Explanation: This option correctly highlights the flexibility in cancelling subscriptions based on the provided parameters. By including both the 'consumerReference' and 'subscriptionId', a consumer can target a single subscription for cancellation. Conversely, by only providing the 'consumerReference' and omitting the 'subscriptionId', all subscriptions associated with that reference can be cancelled, demonstrating a nuanced understanding of subscription management in telecom network services.