Keisha is creating an input mask and needs to ensure that the user will only enter digits into the field. Which two characters do NOT enforce this rule?

0 and 9

9 and ?

? and L

L and 0

Technician a says that with self-adjusting clutch systems, the release bearing constantly rotates. technician b says that the ball bearing portion of the release bearing should be lubricated with high-temperature grease during routine maintenance. which technician is correct?