JEE Main 2023 Chemistry question

The correct relationships between unit cell edge length 'a' and radius of sphere 'r' for face-centred and body-centred cubic structures respectively are -

• (A)r = a and r = 4a
• (B)r = a and 4r = a
• (C)r = and r = 4a
• (D)r = a and 4r = aCorrect