Which statement is true about data connectivity between a customer and a service provider?

Which statement is true about data connectivity between a customer and a service provider?

• Normally the CSU/DSU is the designated demarcation point for the service provider but not the customer.
• The segment between the demarcation point and the central office is known as the “last mile.”
• The local loop is the segment between the CSU/DSU and the serial port on a router.
• Putting data on the local loop is the responsibility of the DTE.

Exam with this question: CCNA Exploration 4: EWAN Chapter 1 Exam