Refer to figures.
ICAO Annex 10, Volume II

5.2.1.4.1 Transmission of numbers
5.2.1.4.1.1 All numbers, except as prescribed in 5.2.1.4.1.2, shall be transmitted by pronouncing each digit separately.

ICAO states: "When radiotelephony is used, the abbreviations and terms are transmitted using the individual letters in non-phonetic form." The following abbreviations and terms refer to this statement:

ACC, ADF, ADS-B, ADS-C, AFTN, ATA, ATC, ATD, CPDLC, DME, ETA, ETD, FIR, FMS, GCA, GLS, GNSS, GPS, GPWS, HF, IFR, ILS, IMC, MLS, NDB, NOZ, NTZ, PAR, PDC, PSR, QDM, QFE, QNH, RCP, RNP, RPI, RVR, RVSM, SSR, TMA, UHF, UIR, UTC, VFR, VHF, VIP, VMC, VOR.

Note: This question should be under subject 090 - Communications, however it has been reported under Air Law. We would kindly ask anyone who comes across this question in their Air Law exam to let us know. Thanks in advance.