A typical angiosperm anther is generally:

The correct answer is Option (2) → Bilobed

Each theca holds two microsporangia, so the anther is tetrasporangiate.

Option (2) Bilobed — Correct. A typical angiosperm anther is bilobed, each lobe having two thecae, so it is dithecous. In transverse section it is a tetragonal structure with four microsporangia, two in each lobe.

NCERT Extract:
Stamen, Microsporangium and Pollen Grain – “… A typical angiosperm anther is bilobed with each lobe having two theca, i.e., they are dithecous (Figure 1.2b). Often a longitudinal groove runs lengthwise separating the theca. Let us understand the various types of tissues and their organisation in the transverse section of an anther (Figure 1.3a).”