Comprehensive and Detailed In-Depth Explanation:
* R01:Low likelihood, not the highest priority.
* R02:Relates to Iteration 3, which is out of scope for Iterations 1 and 2.
* R03:High impact and medium likelihood, relevant to both IOS (Iteration 1) and Android (Iteration 2).
* R04:Medium impact and medium likelihood, less critical compared to R03.
Therefore, the correct answer isA (R03).

Comprehensive and Detailed in Depth Explanation:
* Pairwise Testing(also known as2-wise testing) ensures that all possiblepairs of input valuesfrom each option are covered at least once.
* Theorthogonal arrayorpairwise generation toolshelp determine the minimum number of test cases needed.
* With the given combinations (4 x 3 x 4 x 2), afull pairwise coveragecan be achieved using16 test cases
.
* Pairwise testing is efficient for covering interactions between two factors, avoiding the need for exhaustive testing (96 combinations).
Therefore, the correct answer isD (16).

Comprehensive and Detailed in Depth Explanation:
InAgile projects, theTest Analyst's involvementtypically startsat the beginning of the project.
* Test Analysts workcollaboratively with developers, product owners, and other team membersfrom the outset to ensure thattesting is integrated into the development process.
* Option A (Beginning of the first iteration)is too late since planning and discussing test approaches begin earlier.
* Option B (After signing off user stories)contradicts the Agile principle of continuous involvement.
* Option C (In parallel with coding)also occurs too late since testing considerations should start during planning.
The correct answer isD (At the beginning of the project).

Comprehensive and Detailed in Depth Explanation:
Portability testing verifies that software can be transferred from one environment to another with minimal effort. It checks for installation, adaptation, and replacement issues.
* a) Insufficient, unclear installation or de-installation instructions:This directly relates to portability because improper installation procedures can affect moving the software to different environments.
* e) The stock control barcodes cannot be read by the replaced barcode scanner:This issue is associated with compatibility and adaptability between devices, which is crucial in portability testing.
Optionsb) and d)relate to usability and performance testing, not portability.
Optionc)relates to security or access control testing.
Therefore, the correct answer isA (a, e).

Comprehensive and Detailed in Depth Explanation:
To determine the number of test cases, we follow the coverage rules:
* Basic Behavior:One test case for the standard check-in process without errors (1 test case).
* Error Handling (Exceptions):There are 7 exceptions listed (E1 to E7), and each needs a separate test case.
Hence, the total number of test cases is1 (basic) + 7 (error scenarios) = 8.
Therefore, the correct answer isB (8).