When performing a total alkalinity titration using Standard Method 2320B, what is the standard titrant used and what is the typical pH endpoint for a water sample with alkalinity around 150 mg/L?

• 0.1 N Sodium Hydroxide; endpoint pH 8.3
• 0.1 N EDTA; endpoint pH 10.0
• 0.05 N Silver Nitrate; endpoint pH 7.0
• 0.02 N Sulfuric Acid; endpoint pH 4.5