about "ping" program

[Chetan Prasad]

Which of the following statements are true about the "ping" program: 
(There could be more than one answer. Enter the correct choice(s) as a comma-separated list in alphabetical order. For instance, if a, b, and c are right, enter "a,b,c".)

1. ping can be used to measure end-to-end delay.
2. ping can be used to test if a machine is alive.
3. ping can be maliciously used as a way to attack a machine by flooding it with ping requests.
4. Every machine on the Internet will reply to ping requests.
5. ping sends out ICMP ECHO_REQUEST message to the destination.

pls answer dis ?? i dnt knw d correct answer ......

Thanks & Regards

Chetan

[Cybertech]

for the question related to PING

All the options are correct 

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a

b

c

e