If you want to multiply a binary numeral by$2,$ what do you$$ do$?$

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Part $1$

Select the correct choice below and fill in the answer box to complete your choice.

A$.$

Append a

$$

enter your response here on the right.

B$.$

Remove a

$$

enter your response here from the right.

C$.$

Remove a

$$

enter your response here from the left.

D$.$

Append a

$$

enter your response here on the left.