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How does the addition of magnesia and alumina affect soda lime glass?

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How does the addition of magnesia and alumina affect soda lime glass?

(a) Enhances mechanical strength

(b) Reduces porosity

(c) Increases softening temperature

(d) Improves chemical durability

The question was posed to me in a national level competition.

I'd like to ask this question from Types of Glasses and their Properties topic in section Glass & Elastomers of Engineering Material & Metallurgy

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The correct option is (d) Improves chemical durability

Easy explanation: Sodium carbonate is added to fused quartz glass to lower glass transition temperature. However, this results in water solubility. In order to prevent this, magnesia (MgO) and alumina (Al2O3) are added, which increases chemical durability of the glass.

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