Which of the following statement is an interpretation of the SIGMET?
LSAW SWITZERLAND 0307 SIGMET 2 VALID 030700/031100 LSSW mod to sev cat fcst north of alps btn fl 260 and fl 380 / stnr / intsf =
a. Severe turbulence observed below FL 260 north of the Alps. Pilots advised to cross this area above FL 380
b. Moderate to strong clear air turbulence of constant intensity to be expected north of the Alps
c. Moderate to severe clear air turbulence to be expected north of the Alps. Intensity increasing. Danger zone between FL260 and FL380
d. Zone of moderate to severe turbulence moving towards the area north of the Alps. Intensity increasing. Pilots advised to cross this area above FL260
LSAW SWITZERLAND 0307 SIGMET 2 VALID 030700/031100 LSSW mod to sev cat fcst north of alps btn fl 260 and fl 380 / stnr / intsf =
a. Severe turbulence observed below FL 260 north of the Alps. Pilots advised to cross this area above FL 380
b. Moderate to strong clear air turbulence of constant intensity to be expected north of the Alps
c. Moderate to severe clear air turbulence to be expected north of the Alps. Intensity increasing. Danger zone between FL260 and FL380
d. Zone of moderate to severe turbulence moving towards the area north of the Alps. Intensity increasing. Pilots advised to cross this area above FL260