In the public sector, there are many sources of information that a buyer can use...

Explanation

The correct answers are; tradeshows, internal stakeholders’ knowledge and e-procurement platforms. Intranet is incorrect as this is an internal system so you wouldn’t find information on external suppliers on here the careful not to confuse intranet with internet). OJEU is also incorrect; this is the platform on which tender opportunities in the public sector are published- its not a list of suppliers.