Which of the following scenarios reflects the isolation property?

$1.$ A fairly large transaction is run to import new customers.

$2.$ The import is saved to the logs$.$

$3.$ The import starts to then save to the disk.

$4.$ The disk fails midway through the update.

$5.$ A new disk replaces the failed disk.

$6.$ The backup is applied and the saving of the data is run from the logs$.$

$1.$ Jeff checks his user profile and sees his email address is set to jeff@gmail.com.

$2.$ Jeff changes his email to set it to jeff@outlook.com but does not click on save yet.

$3.$ A customer rep checks into Jeff's account and sees jeff@gmail.com.

$4.$ Jeff clicks on save.

$5.$ Another customer rep checks Jeff's account and sees jeff@outlook.com.

$1.$ User $1$ has $$500$ in their online account.

$2.$ User $2$ has $$300$ in their online account.

$3.$ User $1$ sends user $2$ $$100.$

$4.$ User $1$ has $$400$ in their account.

$5.$ User $2$ has $$300$ in their account.

$6.$ The transaction is reverted.

$1.$ A vendor has $5$ orders available.

$2.$ A customer attempts to purchase all $5.$

$3.$ The system deducts it from the vendor and adds it to the customer.

$4.$ The vendor now has $0$ orders available.

$5.$ The customer has $5$ orders purchased.

$6.$ The transaction is saved.