The shape of IF6 is

Explanation:

The shape of IF6^− ​ is trigonally distorted octahedron.
The central iodine atom has 7 valence electrons.
It gains one electron from negative charge.
Out of 8 valence electrons, 6 are involved in formation of 6 I−F bonds and one lone pair of electrons is present. 6 F atoms are present at 6 corners of distorted octahedron.
The lone pair of electrons distorts the octahedral shape due to electron electron repulsion.

Final answer:
Hence, correct option is A: trigonally distorted octahedron.