Tom is responsible for ordering hardware for a custom home his company is building. The contractor installing the hardware is scheduled to start in $5$ working days, but the hardware is on backorder and will not arrive for another $9$ working days. Fortunately, Tom has $10$ days of slack; however, he shares this slack with the hardware installer. He will have to let the contactor know that the hardware will be ready $4$ days later than expected and that the slack for the installer has been reduced by $4$ days. Tom and the installer share $10$ days of

Group of answer choices

Free Slack.

Shared Slack.

Total Slack.

Critical Slack.

Functional Slack.