Pick up the correct statement from the following :

• the sun's right ascension increases for 0 h to 24 h when it returns to the First point of Aries
• the maximum declination of the sun increases up to 23° N on about 21st June
• the minimum declination of the sun is zero' on 22nd September
• the maximum declination of the sun is about 23° S on 21st December
• all the above.