The maximum value of a TTL for a DNS resource record (RR) is 2147483647 seconds. What is the primary drawback of using this TTL? а. This TTL is approximately equal to 68 years. Once local DNS servers receive this TTL, any changes made to the name-to-IP-address mapping by a DNS administrator will not be seen by clients whose local DNS server has cached this RR. O b. There aren't enough bits in the DNS RR to represent a TTL this large. с. A TTL this long would cause too many DNS servers to cache this RR. d. A TTL of this size would cause too many queries to go to the root servers.

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