Correct Answer  Option 2 : T → P → M → F → D
The correct answer is T → P → M → F → D.
 The SI unit of length is a metre.
 When a larger distance is to be covered, we cannot use the metre.

To cover a larger distance we use km(kilometre), hm (hectometre), and da (decametre). These are called the multiples of Metre.

When the distance is smaller, we use Dm (decimetre, cm(centimetre) and mm (millimetre). These are called the submultiples of Metre.
Prefix

Symbol

Multiple

Prefix

Symbol

Submultiple

Yotta

Y

10^{24}

deci

d

10^{1}

Zetta

Z

10^{21}

centi

c

10^{2}

Exa

E

10^{18}

milli

m

10^{3}

Peta

P

10^{15}

micro

μ

10^{6}

Tera

T

10^{12}

nano

n

10^{9}

Giga

G

10^{9}

pico

p

10^{12}

Mega

M

10^{6}

femto

f

10^{15}

Kilo

k

10^{3}

atto

a

10^{18}

Hecto

h

10^{2}

zepto

z

10^{21}

Deca

da

10^{1}

yocto

y

10^{24}
