Challenge 1: Walking Through Questions 1, 3, and 4 for a Linux
15-Minute Tutorial -- Solution Walkthrough

Question 1 (Operating System): Being on Linux immediately eliminates
Screen Studio and Screenify Studio (Mac only). Cap is also not yet a
fully mature option on Linux, since its own Linux support is still in
development per Chapter 5. This leaves DemoPolish, Trupeer, and
Descript as the tools genuinely available -- DemoPolish and Trupeer
because they're web-based and OS-agnostic on input, and Descript
because it explicitly supports platforms beyond just macOS (though its
own support is Windows + Mac specifically, not Linux -- worth noting
this actually removes Descript too, leaving DemoPolish and Trupeer as
the only two tools genuinely usable end-to-end on Linux today).

Question 3 (Length): The tutorial needs 15 minutes. DemoPolish's hard
10-minute cap rules it out entirely for a single continuous video.
Trupeer's own caps (3 min Free, 8 min Pro, longer on Scale) also fall
short of 15 minutes on its lower tiers, though its Scale plan's higher
limits would need to be checked against the actual number of minutes
Scale allows. Neither tool comfortably fits a single 15-minute
recording without either a higher-tier plan or splitting the content.

Question 4 (Needs to explain "why"): The tutorial needs to explain
several real design tradeoffs, so per Chapter 7, only Trupeer's
"talk through it naturally" or "provide a pre-written script" modes
would actually deliver on this -- its fully automatic mode would not,
regardless of how the length question is resolved.

Putting it together: on Linux specifically, the realistic path is
Trupeer (not DemoPolish, due to the length cap; not Descript, due to
OS), using a deliberate narration mode (not the fully automatic one),
very likely requiring either its Scale plan or splitting the 15-minute
walkthrough into multiple shorter Trupeer videos to fit under a lower
tier's own cap.

WHY THIS WORKS AS AN ANSWER
------------------------------
This exercise checks that the reader applies all three questions in
sequence rather than jumping straight to a single answer, correctly
eliminating tools at each step and recognizing that Descript's own OS
support (Windows + Mac) doesn't actually cover Linux either, a detail
easy to miss if Question 1 isn't checked carefully against each tool's
exact platform list.