Which of the following statements describe(s) the properties of a purely segmented memory system?

Ⅰ．It divides memory into units of equal size

Ⅱ．It permits implementation of virtual memory

Ⅲ．It suffers from internal fragmentation

A．Ⅰ only

B．Ⅱ only

C．Ⅲ only

D．Ⅰand Ⅲ

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