Which matters can be studied in mineral nutrition?

(A) Mineral nutrition primarily focuses on the following aspects:
$1$. It focuses mainly on inorganic plant nutrition.
$2$. It helps in identifying elements essential for the growth and development of plants.
$3$. It involves studying the criteria for establishing the essentiality of mineral elements.
$4$. It examines the physiological and metabolic roles of essential elements.
$5$. It covers the study of deficiency symptoms caused by the lack of specific nutrients.
$6$. It explains the mechanisms of nutrient absorption from the soil.