Identify the Letters of the Choices That Best Match the Phrases

Identify the letters of the choices that best match the phrases or definitions.
-It measures the amount of space between words.

A) Color value
B) RGB triplet
C) Style rule
D) Absolute units
E) Hexadecimal
F) Saturation
G) Relative units
H) Pixel
I) Tracking
J) Kerning
K) Leading
L) ems