How many “hello” output lines does this program print? code/ecf/forkprob4.c 1 #include "csapp. h" 2 3 void doit() 4 { 5 fork(); 6 fork(); 7 printf("hello\n"); 8 return; 9 } 10 11 int main() 12 { 13 doit(); 14 printf("hello\n"); 15 exit(0); 16 }

What is wi-fi infrastructure? a metropolitan area network that uses radio signals to transmit and receive data a communications technology aimed at providing high-speed wireless data over metropolitan area networks a means by which portable devices can connect wirelessly to a local area network, using access points that send and receive data via radio waves includes the inner workings of a wi-fi service or utility, including the signal transmitters, towers, or poles and additional equipment required to send out a wi-fi signal