inventory valuation methods IAS 2( cost, fifo , lifo )

For a general trading company (which buys and sells goods ), like using a (computer ,phones and electronic) shop as an example

it has many types of items like fridges , washing machines, computers, laptops , ipads , microwave,(now these can be unique items each , as well as multiple pieces of the exact same model )

so what are the types of inventory valuation allowed ?

like if were to buy 10 models of iphone 15 256 gb of the exact same type (just the color is different ),for the same price , and the later on , during the year the prices fell , and we bought another 12 pieces for cheaper prices (so now what method of costing we can use during the sale ) ,

if during the end of the year if we were to sell an iphone , what should be the cost attributed to it ?

we have an option to use the exact cost we bought it for ? or fifo or weighted average ? right ? and we have made the decision to use FIFO .
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Now if were to buy iphone 15 pro max 256 gb , can we record this using the weighted average method ? will IAS 2 ALLOW THIS ? , it mentions about choosing measuring items using the same method for similar economic characteristics , what does this mean ?

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If we were to buy 10 exact fridges from the same year and model , and then buy another 20 fridges during the year of the same year and model with cheaper prices ,
so when we were to make a sale during the end of the year , can we use the exact COST method for the purpose of costing ?

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are the above allowed under ias 2 ? can we use different methods of costing for the iphone 15 , iphone 15 pro max , and the fridge ?