Which argument values should you use for PCQ to allow 256k maximum download and upload for each client?

The correct answer involves using the correct arguments and values that configure PCQ (Per Connection Queue) to limit both the maximum download and upload rates for each client to 256k.

Using a rate of 256000 in the configuration specifically defines the bandwidth limit for each individual client connection. The unit used is in bits per second, and since 256 kilobits per second equates to 256000 bits per second, this is the appropriate setting to ensure that no single client can exceed this bandwidth limitation.

Furthermore, the use of the 'src-address' as the classifier ensures that the rate limiting is applied based on the source IP address of the clients. This means that each unique source address will be limited to the specified rate, allowing for effective management of bandwidth and ensuring equitable distribution among all users.

In contrast, other options either set inappropriate rate values or utilize incorrect classifiers that do not achieve the desired bandwidth limiting per source client. This makes the option which specifies the correct rate and classifier the most appropriate choice.