Answer:
Option (b) Presence Information.
Step-by-step explanation:
Presence Information as the name suggests it includes the report of the employees present in the office at the moment. So, option (b) Presence Information is the best option available for Joshe as a Project Leader to keep track of the developers and analysts about their presence in the office. This can also be used weather the employees are busy, available or in a meeting or out of office and their availability on working on the project. Option (a) Desktop Sharing doesn't solves the purpose as different employee can share the desktop of a different employee. Option (c) Web Conferencing is not a correct option as it doesn't solves the purpose. Option (d) instant messaging doesn't solves the purpose as if they are busy in a project they might not be able to message instantly and it might be understood as Out Of Office and its not correct option available.