Operating System (OS)
The memory allocation scheme subject to "external" fragmentation is

swapping
segmentation
pure demand paging
None of these
multiple contiguous fixed partitions

ANSWER DOWNLOAD EXAMIANS APP

Operating System (OS)
A public key encryption system

allows only the correct sender to decode the data
allows only the correct receiver to decode the data
None of these
allows anyone to decode the transmission
does not encode the data before transmitting it

ANSWER DOWNLOAD EXAMIANS APP