In angiosperms,what does the archesporium give rise to?

Given below are two statements.
Statement $I$: Generally,anthers in angiosperms are dithecous,having two pollen sacs in each lobe.
Statement $II$: Each sporangium produces pollens from sporogenous tissues by the process of sporogenesis.
In light of the above statements,select the correct answer from the options given below.

Select the appropriate option regarding the anther.

Identify the labelled part $X$ from the figure:

$A$ typical angiosperm anther is:

The saccus of $Pinus$ pollen is a modification of: