PPP can support several types of Network layer protocols that might use the connection.?

When using the router keepalive feature, what is the default amount of time between the messages sent?

A) 30 seconds B) 60 seconds C) 10 seconds D) 5 seconds

In the expression

n = a + rand() % b; a) b is the shifting value b) a is the scaling value c) b is equal to the width of the desired range of integers d) both a) and c)