Consider the following pace missions :I.Axiom-4II.SpaDeXIII.GaganyaanHow many of the space missions given above encourage and support micro-gravity research?

1. A

   Only one

   Only one. More than one of these missions supports micro-gravity work.

2. B

   Only two

   Only two. Axiom-4 and Gaganyaan are human-spaceflight / station-class missions that support micro-gravity research. SpaDeX is a docking technology demo, not keyed as a micro-gravity lab.

3. C

   All the three

   All three. SpaDeX is the extra.

4. D

   None

   None. Two are keyed.

Summary. Official Set A key is (b) only two. Axiom-4 is a commercial station mission; Gaganyaan is India’s human spaceflight programme — both are micro-gravity research platforms. SpaDeX is ISRO’s docking experiment, not counted here as a micro-gravity research mission. Two of three.