Answer:
Short term is constrained in length and limit
Step-by-step explanation:
Short term memory also referred to as active or primary memory is the limit with regards to holding, however not controlling, a modest quantity of data at the top of the priority list in a functioning, promptly accessible state for a brief time frame. For instance, short term memory can be utilized to recall a telephone number that has quite recently been presented.
This is the reason why Oliver can't remember the number.