Chemosynthesis and photosynthesis are alike in that both

Which of the following photosynthetic bacteria have both $PS-I$ and $PS-II$?

Assertion : Dark reaction occurs only at night in the stroma of chloroplast.
Reason : $CO_2$ fixation occurs only during $C_3$ cycle.

$CO_2$ is formed in all of the following except:

$I.$ Photosystem-$I$ is a photosynthetic pigment system located on the appressed part of grana and thylakoids.
$II.$ Photosystem-$II$ is a photosynthetic pigment system located on the non-appressed part of stroma only.
Identify whether the given statements are correct or incorrect and choose the correct option accordingly.

Which of the following is the first stable product in the $C_3$ and $C_4$ cycle of photosynthesis,respectively?