Identify the correct statements for pollen grains

(A) Pollen grain represents male gametophyte.
(B) Pollen grain is a haploid unicellular body.
(C) The hard exine of the pollen is made up of sporopollenin.
(D) The intine of the pollen is composed of oxidative polymers of carotenoids or carotenoid esters.

Choose the correct answer from the options given below:

(A), (B) and (C) only

The correct answer is Option (2) → (A), (B) and (C) only 

Each cell of the sporogenous tissue within the microsporangium has the potential to give rise to a microspore tetrad, which consists of four cells. These cells are referred to as pollen or microspore mother cells (PMCs). The process by which microspores are formed from a PMC through meiosis is known as microsporogenesis.During microsporogenesis, the PMCs undergo meiotic division, resulting in the formation of microspores. These microspores are initially arranged in clusters of four cells, known as microspore tetrads. As the anthers mature and dehydrate, the microspores separate from each other and develop into individual pollen grains. The pollen grain is the first cell of the male gametophyte.

Pollen grains are generally spherical measuring about 25-50 micrometers in diameter. It has a prominent two-layered wall.The inner wall of the pollen grain is called the intine. It is a thin and continuous layer made up of cellulose and pectin. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known. It can withstand high temperatures and strong acids and alkali. No enzyme that degrades sporopollenin is so far known.The inner wall of the pollen grain is called the intine. It is a thin and continuous layer made up of cellulose and pectin.