Which chemical compound is commonly known as 'Washing Soda'?

Options:

• A: Sodium Bicarbonate ($NaHCO_3$)
• B: Sodium Carbonate Decahydrate ($Na_2CO_3 \cdot 10H_2O$)
• C: Calcium Carbonate ($CaCO_3$)
• D: Sodium Hydroxide ($NaOH$)

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