Zscaler Shares Drop 24 in Premarket Trading After Cautious Outlook Marvell United Zscaler Highlight Key Market Themes Barrons Analysis Irans Defiance and Rejected Peace Offer Keep Middle East Tensions High Threatening Global Oil Flows General Motors Introduces Cadillac Vistiq a New AllElectric SUV with 300Mile Range USIran Peace Talks Show Progress but Key Disputes Over Uranium and Strait of Hormuz Tolls Remain Airtel Defends Priority Postpaid Plan Before DoT Panel Assures No Prepaid Service Degradation US Productivity Growth Decelerates in Q4 as Unit Labor Costs Rise