Final answer:
E-commerce transactions are conducted through the Internet and Telephone, reflecting the increased globalized competition expanded by technology and communications.
Step-by-step explanation:
E-commerce involves interfaces for customer transaction that are facilitated primarily through technology. The correct answers for the interfaces used for customer transactions in e-commerce are Internet and Telephone. This means that the options for this question are D. Both A & B. E-commerce allows consumers to order products and services online from various businesses all over the world, significantly increasing the competition among local businesses. Moreover, with the advancement in communication technologies, business-to-business (B2B) websites enable transactions where buyers and suppliers can engage from any global location.