Global Business-to-Business (B2B) E-commerce Market By Type (Buyer-oriented E-commerce, Supplier-oriented E-commerce, and Intermediary-oriented E-commerce), By Application (Network as a Service (NaaS), Data as a Service (Daas), Storage as a Service (STaas), and Back-end as a Service (BaaS)), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029