Identify the incorrect statements from the following regarding the protocols used in the TCP/IP protocol suite.
A. IP is a reliable connection less protocol.
B. ARP is used to find the physical address of a node given its logical address.
C. ICMP is used to send notification of datagram problems to the recipient of the message.
D. IGMP is used to facilitate simultaneous transmission of a message to a group of recipients.
Choose the correct answer from the options given below:

Explanation

Statement A is incorrect because IP (Internet Protocol) is a best-effort, unreliable, connectionless protocol — it does not guarantee delivery, so calling it 'reliable' is wrong. Statement B is correct: ARP (Address Resolution Protocol) maps a known logical (IP) address to the corresponding physical (MAC) address. Statement C is incorrect because ICMP reports datagram problems (such as an unreachable destination or expired TTL) back to the original sender of the datagram, not to the recipient. Statement D is correct, since IGMP (Internet Group Management Protocol) manages multicast group membership so a message can be delivered simultaneously to a group of recipients. Hence the incorrect statements are A and C only.