Answer:
- Chunking.
Step-by-step explanation:
'Chunking' is described as the memorization strategy that involves the splitting(also known as recoding) of a voluminous concept or large information into smaller pieces to make it convenient and efficient to retain and remember it.
In the given situation, Jamie employs this strategy of 'chunking' by recoding the long eleven-digit number and dividing it into the her best friend's birth year(1977) and phone number of her aunt '255-2901' which makes it easier for her to retain the information(by grouping these chunks/pieces together) in her short-term memory and remember it for a longer period of time.