True or false: When London cabbies acquired "The Knowledge," it resulted in overall positive effects on their memory performance.

False $-$ cabbies' memory performance is better for The Knowledge, but is worse than controls' for other types of information

False $-$ cabbies' overall memory performance, including for "The Knowledge," declined soon after they qualified for their licenses

False $-$ cabbies' memory performance is better for The Knowledge, but memory for everything else is equal to controls' memory

True $-$ cabbies' memory performance is uniformly better than controls'