Which of these is correct for λ in EWMA expression?$

• A. 0 > ‚âà√≠¬¨‚Ñ¢
• B. 1 < ‚âà√≠¬¨‚Ñ¢
• C. 1 ‚Äö√Ñ√∂‚àö¬¢¬¨√ü ‚âà√≠¬¨‚Ñ¢
• D. 0 < ‚âà√≠¬¨‚Ñ¢ ‚Äö√Ñ√∂‚àö¬¢¬¨√ü 1