Which mode of Inmarsat-B communications may be possible with a lower received signal strength?

Correct Answer: Option B — TELEX

TELEX is a low-bandwidth, character-oriented communication mode. Because it transmits data at a significantly slower rate than voice or fax, it requires a much lower signal-to-noise ratio to maintain link integrity. Consequently, TELEX remains operational even when atmospheric conditions degrade the signal strength below thresholds required for voice.