Question: What is the expected behavior of the Contact Manager Server and External Client when a vCard property lacks a value?
Option 1: The property with no value is included in the vCard object with a default value.
Option 2: The property without a value is excluded from the corresponding vCard object.
Option 3: An error message is generated for each missing property value before vCard object creation.
Option 4: The Contact Manager Server and External Client ignore vCard objects with any empty properties.
Explanation: According to the specified behavior for handling vCard properties without values, both the Contact Manager Server and External Client are required to omit such properties from the resulting vCard object. This approach ensures that only relevant, populated information is included in the final vCard, maintaining data integrity and efficiency.