Frequencies for receiving HF MSI (Maritime Safety Information) are:

Correct Answer: Option D — Specified HF NBDP frequencies

HF MSI broadcasts are transmitted using Narrow Band Direct Printing (NBDP) technology. These broadcasts are specifically assigned to dedicated HF NBDP frequencies, distinct from voice or general telex channels, to ensure that safety information is received reliably by GMDSS-equipped vessels operating in the high seas areas.