Statement — “Let there be a signboard indicating directions and instructions.”\nAssumptions:\nI. A signboard can be prepared without using any language.\nII. A signboard is the only effective tool to indicate directions.

Introduction / Context:
The recommendation is to install a signboard to communicate directions and instructions. We test whether the statement commits to “language-free” communication or to exclusivity of signboards over other tools.

Given Data / Assumptions:

• Statement: Put up a signboard for directions/instructions.
• Assumption I: Signboards can be prepared without any language.
• Assumption II: Signboards are the only effective way to indicate directions.

Concept / Approach:
The statement merely selects a medium (a signboard). It does not require that the board be language-free; it could use text, icons, or both. Nor does it claim exclusivity; maps, announcements, and digital displays can also work.

Step-by-Step Solution:
1) Test I: The statement works whether the board uses text or pictograms; language-freeness is not necessary.2) Test II: The statement does not deny other effective media; it simply recommends one.

Verification / Alternative check:
Even if multiple tools exist, installing a signboard can still be sensible.

Why Other Options Are Wrong:
Only I/Only II/Either/Both introduce constraints not required by the recommendation.

Common Pitfalls:
Over-reading exclusivity or special format where none is stated.

Final Answer:
Neither assumption I nor II is implicit.