Exercise 3: "You Must Pay $99 a Year to Run on an iPhone" — Possible Solution
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TASK
Say what the sources support, what they do not, and where you would check.

WHAT THE SOURCES SUPPORT
A free Apple ID can be used to run an app on a device, with restrictions.
Reported restrictions: provisioning profiles expire after 7 days, up to 3
devices, up to 3 apps per device, up to 10 App IDs, and you rebuild and run
from Xcode to renew.

WHAT THEY DO NOT SUPPORT
- The claim that payment is required just to run on your own device.
- Any statement about what a paid membership adds. This chapter did not
  cover it.
- The current figures, which come from a blog post and forum threads and
  which Apple has changed before.

WHERE TO CHECK
Apple's account help pages on memberships, and the provisioning profile
pages, which are the authoritative source. iOS Development - Production &
Publishing 4 covers signing for distribution.

REWRITE
"You can run an app on your own device with a free Apple ID, with limits
such as profiles that expire after about a week; check Apple's current
membership pages for the exact limits."