为了满足SOLAS第12章第12条有关要求下列那些说法是正确的?

.1 in each cargo hold, givingaudible and visual alarms, one when the water level above the inner bottomin any hold reaches a height of 0.5 mand another at a height not less than 15% of the depth of the cargo hold butnot more than 2 m. On bulkcarriers to which regulation 9.2 applies, detectors with only the latteralarm need be installed. The water level detectors shall be fitted in the aftend of the cargo holds. For cargo holds which are used for water ballast, analarm overriding device may be installed. The visual alarms shall clearlydiscriminate between the two different water levels detected in each hold；

.2 in any ballast tank forward ofthe collision bulkhead required by regulation II-1/11,giving an audible and visualalarm when the liquid in the tank reaches a level not exceeding 10% of the tankcapacity. An alarm overriding device may be installed to be activated when thetank is in use；and

.3 in any dry or void space otherthan a chain cable locker, any part of which extends forward of the foremostcargo hold, giving an audible and visual alarm at a water levelof 0.1 m above the deck. Suchalarms need not be provided in enclosed spaces the volume of which does notexceed 0.1% of the ship’s maximum displacement volume.